/diy/ - Do It Yourself

What are you going to do down there?

>>1120005

Jack off to fish I guess

>>1119992
>$1.05 USD / lb

We'll to start you're gonna need $92,000 for that lead

>>1120009

mother FUCKER

Nothing else is heavy enough. If I did it with concrete it would take 884 fucking buckets

It looks like about a thousand cubic feet of sand would hold it down. If I just welded another shipping container under it and filled that bit by bit with sand until it sunk, then continued till it was full, that seems like it should work.

>>1119992

Sooner or later you'll realise it's probably best that you don't poison the well further by reproducing.

>>1120015

Don't worry. I don't think there's any woman I could convince to come down and live in that thing with me, even if there was room for 2 people.

You should be fine
Just be sure to coat everything with 2-3 coats of Scotch-Gard first

>>1119992

Shipping containers are known to crumble under lateral pressure, thus unless you know really well how to calculate the psi and have the container stress ranges, you are making a steel underwater coffin.

If I have to go by a gut feeling I'd go with large enough septic tank, at least they have the right shape to distribute pressure and most of them are designed to be corrosion resistant.

>>1120024
>Shipping containers are known to crumble under lateral pressure

That is a problem if you bury them, but not if you're putting one underwater. The stress on the container will not be downward, from water pushing down on it as you might imagine, but upward, from the extremely buoyant air trapped inside.

>unless you know really well how to calculate the psi

This is irrelevant as there will exist no pressure differential between the inside and outside. That is why the water does not rise up through that hole in the floor. It's like a cup turned upside down and pushed into water.

>>1120027

But he has an air line, so the unit will have to be pressurised.

>>1120031

There's an air compressor up top that maintains pressure in the process of sending a continuous flow of fresh air down.

>>1120018
Don't worry anon, if she doesn't want to go down there with you she is the wrong person. No matter what other aspects a woman may have, that she hitch with you based on your possessions and not a quality of you yourself is the biggest red flag possible. Sadly it also happens that many women are like that. She may be smart to not marry a bum living innaseas, but smartness doesn't make love. the right woman won't care where you are, all she'll care about is that you are you. And frankly, I don't want a girl just to have one, I want the ONE, and there's no point if she isn't the right one. But that's just me being an overly romantic faggot.

>>1120027
I believe underwater is their natural habitat, as I have never seen one float.

Can they even achieve buoyancy?Are there intact shipments of waifu pillows untouched at the bottom of the sea, safely entombed in shipping containers?

>>1120045

It's really sweet you wrote all this, but you misunderstand what sort of person I am. I am not a big fan of human contact of any kind.

There was a long period where some part of my biology, some primal bit of my brain made me badly want romance. I just ignored it and focused on building shit and making money until it withered up and went away.

I would like someplace cozy and insular that is as removed from the rest of humanity as possible, hence this project idea. I am not lonely. I am the only company I can tolerate.

>>1120027

>That is a problem if you bury them, but not if you're putting one underwater

That will be the case If the depth is pretty small, the pressure can and will crush a container with air in it if the structure is not reinforced.

>This is irrelevant as there will exist no pressure differential between the inside and outside

only if you have a system crating air pressure to be equal to the outside water pressure

>>1120058
>That will be the case If the depth is pretty small, the pressure can and will crush a container with air in it if the structure is not reinforced.

You don't understand. That applies to submarines and submersibles because they maintain sea level air pressure inside regardless of depth.

A structure like the one in the picture does not have that problem. It is ambient pressure by design.

>only if you have a system crating air pressure to be equal to the outside water pressure

No "system" is needed. It works the same way as a diving helmet. Compressed air is pumped down through tubing. Excess air bubbles out through the moon pool or a dedicated exhaust.

In order to bubble out, the air must first meet, then slightly exceed outside water pressure. In this way the air pressure inside a diving helmet is always at exactly the right pressure to breathe whatever depth you're at.

Fill the buckets with water for free

Why don't you fix the container on the ground floor?
Too complicated construction?

>>1119992
won't the weight of the container make up for a lot of that?

>Buried shipping container
>BUT THIS TIME, underwater

Make a change, I guess. In b4 "I want to build a spaceship from a shipping container".

>>1120011
>Nothing else is heavy enough
Of course there are denser materials, but pretty much all of them cost a lot more

>>1119992
For the air pressure to equal the water pressure and stop the container from imploding the mass of air would equal that of the water and therefore you don't need any ballast. Q.e.d. But your head would explode.

>>1119992
Lead os a buck a pound strap. Instead of buckets make form blocks with 2x6 above pond and rebar eyes to ti it on. Then just flio em into the water and start tying rope. Also, without an air tight chamber you cant equalize shit. Would be hard to get in and out without a equalizing chamber. Then again i see this thread the second the old one dies so probably troling.

Just bury it in dirt instead...

>>1120045
I think itd be more "this mutherfucker lives under a cow pond wtf." Than his possessions. Even if it was a pretty nice container.

>>1120074
Not just welding a bunch of scrao shit to it. Cars are 40 bucks a ton give or take. Just get a few and torch them to grt rud of the bullshit and weld to the container.

>>1119992
So the buoyancy of the air in the container would be about 88,400lbs. That's force applied to the top of your container. Your average 20' shipping container is designed for a payload of about 55,126. (See: http://www.dsv.com/sea-freight/sea-container-description/dry-container )
Will the container be able to stand the stress of that?

>>1120090
Fucking dumb ass

My little Shipping Container. Burrying is magic!
Is there rule 34 with shipping containers?

>>1119992
This might work in 10 feet tops, but 20 will at best flood your container, at worst kill you painfully

>>1120024
The game

>>1120045
Right girl will double as ballast

instead of trying to anchor your little rapture with 100k worth of poisonous metals, why not just use chains to keep it down?

>>1120121
Not sure if bait or never took a physics class.

I feel like you are creating an equal problem as the containerbunkerists. In an inverted way. The walls might not take the lift. It's 33 tonnes of lift.
But if you want to try this out you could use concrete as a ballast. And no buckets here, just make a box big enough and pour it in. Secure the container with chains to the huge concrete chunk. Concrete weighs approximately 2,5tonnes per m^3 so it's 1,5 tonnes per m^3 underwater.
That's 21m^3 of concrete, three cars full of it, no big deal. Not even that expensive. You just need some wood, rebar and then elbow grease.
It isn't probably any harder than building an foundation for a house.

>>1120176
Not OP, but steel is good at taking tensile loads which will be the type in this application.
My gut tells me it would tear though.

>>1119992
OP, you calculated the ballast assuming the shipping container was empty and weighed nothing.
The more shit you put in there, the less ballast you need.

>>1120090
Short answer is "no"

>>1120011

How about Big Bags? (1m3 synthetic canvas bags used to deliver medium quantities of sand and small stones.)

You'd need about 30, make some wood frames to keep the big bags open under water. Run a chute to them once they are on the floor, fill em up from a barge.

>>1120191
Explain

>>1120241
Having a margin of safety is a good thing

>>1120048
No, I get that. My point was more along the lines of my own thinking "there's no point in just going out and getting hitched for the purpose of getting hitched if you're not going to find the right person". So, I'd rather be single, I don't mind it at all. I'm not a big fan of human contact, so I'd rather be alone because it's not worth it to me to waste my time on the wrong people. I'm probably always going to be single, which is fine. My point was that if no one was the right person you wouldn't lose anything by them not going down there anyway. Actually I'm surprised by how similar what you said is to how I personally feel. For the longest time the only thing I've really wished for is a comfy place removed from humanity. I'm just not full on wizard yet though because, if in the unlikely chance I did meet the girl I really got along with,I wouldn't turn her down of course and rather be extremely elated, but otherwise I'm not interested in going out and seeking human society.

You're better than me though, I can subdue the romantic urge in me, because I know no one is out there for me, but I can't do away with it.

>>1119992

you can forget windows

you'll be lucky if it can even keep the water out

also no way you'll be able to have a shitter or any electricity

that's begging to die

also doubt it will last long before it corrodes

I remember a blog post from years ago about a family that created an underwater "tent" filled with air, sort of like what OP suggests. It was fabric, held down with blocks at several places. They filled it with air from compressed cylinders. They didn't live in it. But they could go there, scuba down, get in and take their masks off. They used it for one summer then took it out.

So, what's the problem with sinking it full of water, and then pumping air in after its anchored to the pond-floor?

>>1120186
>>1120243
Not him but why wouldnt it?
20ft container is about 5000 pounds that should at least take some of the weight needed to sink it

>>1120090
>won't the weight of the container make up for a lot of that?
Regular containers EW is 4,800 pounds.
not a significant factor considering how much is required - 88,400 pounds

>>1120209

Chain it to what?

>>1120295

This thing

https://www.youtube.com/watch?v=Phj3lLEtWlk

There's actually a bunch of copy cats who did the same thing on Youtube, though not as big. Makes me wonder how big you could go with it.

>>1120323

How do you anchor it to mud?

>>1120073

Water does not weigh anything in water.

I've setup moorings that have held multiple 6 - 12 ton boats in place during tropical storms using chain wrapped around large rocks on the bottom. Only bad part is you have to dive to do it but you're talking about submerging a container so I'm assuming you have basic dive gear and training. Finding a rock that can hold down 40 tons shouldn't be hard. That'd be large truck to short bus sized.

>>1119992
Why not add ballast tanks and screw props to the container? Then you can have a mobile home under water that you can take anywhere.

>>1120406

I don't want to go anywhere. It's ambient pressure so it would strain my ear drums every time I ascended or descended. It would be limited by the number of batteries I could carry and would be dependent on a surface support ship. The life support would also not last very long if it's just compressed air bottles.

If it's stationary and has a power/air umbilical to shore, it can operate indefinitely. There's nothing I would need to move around to see in a lake that's much different than what I could see from a fixed position.

Really I just wanna chill in bed reading books and listening to music, watching the fish go by.

>>1120408
Buy an aquarium.

>>1120411

This is much better than an aquarium.

>>1120413
Then go to dubai and rent a hotel room at atlantis.

>>1120414

I don't want to rent it, I want to own it and live there. That hotel also isn't fully submerged, it just has one room with a window looking out into a little man made lagoon.

I want to be in a fully submerged structure cut off from the world

It's a cool fantasy. But the reality of it would be less impressive and more leaky/claustrophobic/terrifying I think.

>>1120416
>square room
its like they want it to break

>>1120430

Still zero pressure relative to ambient ...

>>1120430

I'd worry more about the shark swimming up through the bottom.

>>1120416

>being underwater
>having enough light to get morning glories to bloom

PICK ONE

>>1120430

Ambient pressure. See the open hole in the floor? Water doesn't just crush anything you put into it. There has to be a pressure difference between the inside and outside.

I can't believe how many people don't understand this

>>1120461
So basically this entire project hinges on the air compressors.
OP, which ones did you have in mind?

>>1120462
Well one human needs 3.0cf/minute airflow. And it will only be 20-25 feet deep so a standard electric automotive air compressor should be fine.

A pancake compressor will produce quieter/smoother air flow. Oil free, with a moisture trap.

Two of them in parallel, set up with an inline air pressure sensor so if one compressor fails the other immediately kicks in, and ups battery backup with alarm in case of outage.

Even if it all fails I would be ok for long enough to put my gear on and escape so long as there is an inline check valve so air can only come down, not back up the tubing.

How can this shit be so easy in Minecraft but so hard irl

>>1120020
What about that super hydrophobic spray? Legitimately curious as to how much pressure it takes to overcome whatever the process is that keeps water off that stuff...

>>1120465

I'd need to do the math ... but are you sure you don't need much bigger flow to keep CO2 at acceptable levels?

>>1120501

I am sure. If it's enough for a diving helmet it's enough for a habitat, you'd just want to ensure good air flow using fans so that pockets of stagnant air don't build up.

You could even have a second person down, just not for long. You'd also want one of those cheapo CO2 sensors in every room to let you know if levels are getting too high.

>>1120366
Additional pylons... or look into the plow type anchors... or get a large auger bit and work that into the mud...

>>1120502
Probably not the worst idea to keep an emergency air cylinder or two down there... just in case both pumps fail... it's give you time to leave in a safer manner than just bugging the fuck out

>>1120506

Google "spareair". I was lookin at that, maybe keep one in each room and another under my pillow.

>>1119992
Ever wonder why submarines are cylindrical in shape?
Ever wonder why soda cans are cylindrical in shape?

This thing will buckle because the edges and corners will be your weak spots.

>>1120511

You're really dumb. This has been addressed many times in this thread.

In the pic, do you see the boxy room nearest the camera? How come that doesn't implode?

>>1119992
am i the only person on this board who wants to know what Phil Swift can do with an unlimited amount of cans of Flex Seal and shipping container?

https://www.youtube.com/watch?v=fjvNHiFCaPw

>>1120519
because it was made by people who aren't you.

>>1120522

No, because the air pressure inside that box is identical to the water pressure outside of it. This is how the bottom can be open to the sea, but the water does not rise to fill it.

Because there is no difference in pressure between inside and out, it is in no danger of being crushed.

>>1120502

>I am sure. If it's enough for a diving helmet it's enough for a habitat

Not necessarily, the dead space in a diving helmet has a huge influence in the required airflow (free flow vs. mask). The container has near infinite dead space.

>>1120527

Hence the fans. It wouldn't hurt to bump up the airflow however, they sell some pretty beefy compressors even just at home depot.

As long as it'll fit in a small weatherized shack on the shore and doesn't break the bank, some amount of overkill is a-ok.

>>1120527

A quick google and I ended up here :

http://www.engineeringtoolbox.com/co2-comfort-level-d_1024.html

20 cfm ventilation rate is suggested for restaurant level quality, 25 for hospital level.

>>1120481

In Minecraft you control an immortal that can carry an infinite amount of weight.

>>1120531

Also no such thing as buoyancy or pressure

>>1120523
>No, because the air pressure inside that box is identical to the water pressure outside of it. This is how the bottom can be open to the sea, but the water does not rise to fill it.

To be fair the air pressure is identical at the water level only in the picture. As you go up the air pressure doesn't change much, but the water pressure outside decreases, so the air pushes the walls outwards. The max pressure is on the ceiling and it's not insignificant, see >>1120176

>>1120552
>As you go up the air pressure doesn't change much, but the water pressure outside decreases, so the air pushes the walls outwards.

This would be a problem for a very tall ambient habitat but not a single story one.

You're right about buoyancy stress on the ceiling but Aquarius has a box shaped room made out of steel, the ceiling is not thicker than that of a shipping container, it does fine.

>>1120011
how bout water?

>>1120589

>>1120591
why wouldn't it work?

>>1119992
Why are you choosing such an expensive and elaborate way to commit suicide, OP?

>>1120594

Water weighs nothing in water. Go try it in your bath tub. Fill a container full of water and see if it weighs the same underwater as in air.

>>1120596
Wouldn't it hold down whatever it was attached to?

how bout something like this?

>>1120597
Try it. Seriously. There is a point at which intuitions should be adjusted from the simple imaginings of a child, and you're well past it.

>>1120011
Try cast iron.

>>1120605
lol. you're the stupid nigger trying to live in a steel cage under salt water.

>>1120606

Still too expensive. Even concrete, at 2 cents a pound, would be $1,768 not counting the expense of transporting it out to where you'll sink the habitat or how you'd even do that.

Sand is a better choice I think, it's free and you can just suction it up from the bottom under where you're gonna sink the thing.

>>1120005
Hopefully he's going down there to lose consciousness and die.

I know exactly what you need to do. Instead of using an air compressor to pressurise your underwater sanctuary, try hooking the supply line up to the exhaust pipe of 89 Chevy celebrity. The health benefits will be noticeable almost immediately. Good luck fucknuts.

>>1120027
Water will not hold the same level as the first aperture, since air is compressible. You're half right that there won't be a pressure difference, but under the same pressure the ear will take less space, so you can solve it in one of two ways: higher pressure from the umbilical (but how do you scrub CO2 from the air?) or a higher aperture for the moon pool.

>>1120611
At least he knows basic physics. Unlike half the damn thread.

http://www.jul.com/AboutUs.html

>>1120011
Use iron or steel

Ever hear of an anchor? Sailorfag here. You're essentially trying to make a homemade anchor, which is one of the weakest types of anchors. What you need is a mushroom anchor. It's what's used for moorings and buoys. You drop it into the bottom and it sinks into mud/sand and gets harder and harder to take out as it stays in for more time.
>pic related
The sand/mud goes through the holes and it sinks further and further into the bottom. After a certain amount of time, they're practically impossible to remove.

>>1119992
Make sure the alarm isn't tied to the main power source.

>>1120047
>Can they even achieve buoyancy?

Sadly, depending on their contents, they do float. Usually with just a few inches above water so boaters can't see them.

Good movie: All is lost

>>1120616

Worrying about a couple of thousand, or a couple of thousand man hours, is just sad. If you're going to be a mad man do it right. You're taking too many shortcuts.

Fuck containers, just weld your own frame and construct your own walls, make one room completely out of tripple glazed acrylic.

Fuck buckets. Build a bunch of multi-ton concrete pontoons. Rig em together on the water and build your structure on that.

Fuck stationary, have a floating marina on the surface which you can winch the structure up in the middle off. Potentially even raising it back above water by putting air back into the pontoons, although not really necessary.

>>1119992
>doable if the air pressure inside is kept equalized with outside water pressure

And if you can keep the air inside from leaking out at badly welded seams. Good luck with that.

>>1120811
Air leaking out is exactly what guarantees that the pressure inside = pressure outside.

>>1119992
You need to think outside the box OP

>Find a shipwreck
>seal up a water-tight living space somewhere inside the shipwreck via underwater welding.
>pump air into your new living space
>clean it up... this could be a significant task
>figure out how to get pressurised air, power, fresh water, internet and furnature into your new underwater home

>>1119992
Are your calculations for standard pressure? Or after you've canceled for pressure differences.

If where you're setting down is stone at the base you could bolt down a steel plate and then secure the container to that and pull it down via chain and truck or something that has enough pulling power. You could also pile sand on top of the plate afterwards making more secure

>>1120788

I did this in highschool and it took a crane to remove it

>secure container to firm ground with bolts
>wait a few decades for sea level to rise
>instant underwater city
Simple

>>1119992
>>1120599
I honestly think the cement anchors would be the best option.

I'd recommend removing most of the air and making it neutrally buoyant. then you can sink the container into place, hook it up to the anchors and then slowly fill it with air.

You'll have to install everything after you sink it down though.

Also, consider a composting toilet. It'll eliminate the need for a septic system. All you'll have to figure out is preventing water from getting into the gas vents. Shouldn't be too difficult.

>>1119992
https://www.youtube.com/watch?v=0jz2HXYHdN0

>>1120825
You... Don't know how they raise sunken boats do you?

>>1120788
Ahoy what if the home sinks further and the entrance gets blocked? And if he has something buffering the entrance, would it not create a decent amount of tension over time?

>>1120832

The rate of sea level rise is very slow. It's projected to rise only 8 feet in the next 100 years. What climate scientists are actually saying is very different from what hippies believe.

>>1120630
>but how do you scrub CO2 from the air?

No need if the airflow is sufficiently high. Diving helmets don't have scrubbers.

>>1120777

They used a multi million dollar government funded underwater lab as the basis for that. They got it for cheap because it was going to be scrapped.

I would love to own that thing as a permanent home, and put it in some actually nice, clear water instead of that algae choked lagoon.

It looks cozy as fuck, it's just in dirty ass algae infested water

Submarine fag here. Can your shipping container withstand the ~4psi of pressure due to the different depths relative to the top and bottom (~44psi/100ft). Thats ~94 klbf outwards on the ceiling of the container, since the air compressor works against the water pressure at the base of the container.

Most strong bases can remove CO2 for emergency use situations, and installing a handful of fans to minimize the effects of stagnant air would be easy. Humans can adapt to higher CO2 lower O2 levels. You should be able to find some reference on acceptable levels for enclosed atmospheres.

You should really be looking at more robust air compressor systems rated for continuous usage. There are water lubricated/sealed LP air compressor systems that would be more suitable, but kinda overkill in terms of rated flow for your needs.

Gl on your death trap op

>>1120832
Faster way to die.

>>1120011
have you considered sourcing depleted uranium? us gov practically gives it away to the arms companies for free. Heavier than lead too.

>>1120879
Eventually, it will reach equalibrium and stop sinking, since the container is full of air. Like I said, these are used for buoys, and eventually the anchor will stop sinking into the bottom. Otherwise, the Coast Guard would have to replace the buoys far more often. As far as tension goes, it should be no more that the buoyancy force of the container. Get a nice chain and you should be fine.

Have Wayne Lambright design it for you.

>>1120011
if you live in a metro locus and are amerifag like me you could always source window weights from a junkyard...? I see them all over this place by my house.

this is a interestingly terrible idea

in reality, either give up completely, or learn some serious engineering, or join the navy

>>1119992
are you the hampture guy?
-long time no see

Something like this might suck a little less ass.

>>1121032
Sandy, a habitat made for a squirrel is far smaller than what a human will require.

You're not thinking of scale.

>>1120945
Depleted uranium is chemically poisonous and dangerously reactive (it can burn in air), producing a variety of water-soluble poisonous compounds when exposed to air and water.

>>1120032
Mind the pressure difference

>>1119992
Here you go anon
A lot cheaper

>>1120048
It might be a lot easyer and cheaper if you go live in a cave or forest, which is what I will be doing in probably less then a year.
Altough I dont dislike society or women, on fact I love both deeply.
I will mainly be doing it for religious reasons so I can be undistracted from praying, meditation, contemplation, and writing.

>>1121058

I specifically want to live underwater though

>>1121032
ftfy
(finished that for you)

>>1121060
Gonna need a smaller space, first off. And enjoy your implosion when you try and submerse the container.

>>1121080

When you turn a cup upside down and push it into water, does it implode?

>>1121082
If deep enough, yep

>>1121097

If the cup is weak you might blow out the bottom due to buoyancy depending on how you push it, but it would never implode.

>>1121097

No it won't. The bubble of trapped air will shrink as increasing water pressure compresses it, but because the cup is not sealed, it doesn't implode.

A submarine implodes if it dives too deep because it maintains a pressure differential. The inside is always at sea level air pressure. It is not open to the sea as the cup is, the water cannot compress the air without first compromising the hull.

Basically, the prssure difference on the top of the container will be ~0.25 bar, which means ~250kg per m^2 of ceiling. I don't know much about these containers though, maybe someone else can help there.
Calculation for the inevitable questions arising:
dD=2.6m (Height of container)
mW=dD*1cm*1cm (Mass of water)
fW=9.81m/s^2*mW
pW=fW/1cm^2
pW~=0.25 bar

Make the container heavier and/or use anchors.

>>1121141
Just another idea, put some of the ballast containers ontop, they might help relieve the pressure a bit.

>>1120498
Nothing. They coat surf boards and shit with it. I tried my boots.

Did not work
Turned boots smurf blue

Mfw the sidewalk beaded and rolled off water tho...

>>1121067
This thread.

>>1119992
Dear op. Find or buy scrap iron for an all time low of ~$40 a ton. Weld shit all over the outside. Bonus for halff ass even weight and increasing structural integrity.

Throw the mutherfucker in the lake.


Then if you die and metal goes back up someone will get some use out of it.


The fuck is with all the millions in lead anchors and shit. Its a steel container. Get you shitty lincoln crackle box out and start welding car frames and shit too it.

>>1119992
OP, don't use a shipping container. Seriously. There are far better, pressure suited structures, that will be worth the additional cost and still fairly inexpensive. And anon, if you're going to put it in the ocean, you'd be retarded not to use windmill generators for your electricity. Have a small wind turbine farm above yourabode. Living underwater is a cool idea but there are so many better ways to do it that are marginally more expensive and much more resilient.

>>1121045
vacuum cleaner+hole in wall+$40 hazmat suit+oxygen tanks

>>1121224
also remember lots of duct tape

>>1121224
http://www.esafetysupplies.com/Dupont-Tychem-QC-Coveralls-with-Hood-and-Boots.html?gclid=CMvnlLT23dECFQEIaQodskkL5Q
and
http://www.medicalgasregulators.com/O2-Emergency-Setup-Cylinder-Cart-Regulator-Wrench-and-Masks-12400.htm

Make it a dome to resist the pressures under water.

>>1121243
Wayne knows his domes

>>1121243
Shut up Wayne

>>1120594

>>1121290
kek

>>1121290

Needs a tiny habitat in the counterweight.

>>1121309
but what keeps the small container from floating in the counterweight?

>>1121311
It's actually tied to the bottom of the counterweight with invisible chains.

>>1120195
underrated

>>1120458
Samuel L Jackson in Deep Blue Sea.

>>1121290
literally twice the force

>>1120498
It will slowly be eaten, worn away, and dissolve.

>>1119992
Instead of going through all the trouble of loading counter bouyancy why not sink the thing, anchor it to sea/lake floor and then use a hose to pump oxygen into the container and displace the water inside?

>>1119992
Also this isn't how you calculate bouyancy.

>>1121527
>why not

'coz everything inside will get soaked?

>>1120011
884 buckets is still a lot cheaper than $92,000 of lead.
Or you could knock together some plywood formers and make a big-ass concrete tub, sink it and then fill it full of gravel or even mud. That'd hold you down.

>>1121535
Bring it in afterwards, vacuum-sealed in plastic.

>>1121516
Maybe you are dense enough to hold the habitat in place.

>>1120367
Oh boy....

Here's what you do, OP. Get your shipping container, a bunch of scrap sheet/plate, a welding machine, and some skills. Build a steel shell around the shipping container with a sizable gap all around, and include hollow columns below with wide foot pads.

This enclosure should be water-tight with the exception of an opening at the top. Plan things so that the steel structure will be slightly negatively buoyant, and will settle upright when the enclosure space is filled with concrete. Fill it with concrete on land, and when it's hard, move it into the water with a crane. Secure it in place with a few small mushroom-style anchors, which just have to keep it from drifting with any currents.

>>1121603
Take a gallon jug of water, and put it on a scale. It should weigh around eight and a half pounds, depending on the jug. Now put the scale and jug under water. How heavy is the jug now when you weight it?

>>1121596
He's right, though. The anchors would have to be twice as strong in that situation to hold down both the buoyant habitat and the equal upward pull on the cables going to the on-land counterweight.

>>1121609

what is underwater pressure

>>1121610
True, although I was commenting on the fact that my drawing was purposefully bullshit and that it seemed he took it as a serious suggestion.

>>1120011
Or, you can just get 23 bin blocks at 4,000lbs each.

>>1121614
>>1121609
It would weigh the weight of the jug and nothing more. Probably less if the cap in on the jug and there's a pocket of air. If it is plastic, it will probably start floating.

Why not make the shipping container out of lead?

Or just satisfy your fish fetish by converting your container to a livable space on the ground, easier than dealing with your underwater bullshit. From there replace your roof with arched glass and seal the top with a black roof cover with blue backlights. Fill with water and fish, and deal with feeding fish and cleaning some water than this trainwreck.

>>1121625
3300 lbs

>>1121645
The ones here only come in 4k sizes. Internet says they come in 3600 usually. Thus OP would need to just get more if needed.

>>1119992
A shipping container will simply be crushed in on the sides in the water, even if it wasn't fully submerged. This includes having an open underwater entrance.

>>1120245
A fucking barge top kek, we all know he is doing this in a small pond in his back yard!

>>1121584
If its vacuum sealed just load it in before hand? Or would certain stuff get crushed I wonder

Wouldn't buckets full of water anchor it? Bit like a reverse watery parachute.

In order for it to float it has to counter the drag from the buckets. Make the buckets larger or maybe put the ballast on the roof or inside.

Hell you could double wall the container and fill it with sand and rocks from the bottom till it sinks.

>>1119992
Good luck going to jail.

You will absolutely be prosecuted if anyone ever finds out you have 80,000 lbs of lead--contained in home depot buckets--under the water.

If one of those ruptured, you'd poison the water table and kill/injure people and wildlife for miles.

>>1121659
Don't be stupid, that's not how lead poisoning works. OP is a moron and would probably go to jail for this, but not for that reason.
Fisherman lose lead lures, net weights and lead core line all the time--I'd bet there's at least a tonne of lead in the ocean from that alone

>>1121657
>reverse watery parachute
Please please PLEASE tell me you're only 8 or just trolling.

>>1121659

Boat keels are lead. Boats sink.

Lead doesn't leach into the environment once it oxidizes, and because it's so dense the earth reclaims it quickly.

>>1121676
>least a tonne of lead

Actually there's millions of tons of lead from hunting and fishing lost.

>>1121614
Isostatic. If you don't know what that means or why it's relevant, weigh the jug and see what happens.

>>1121676
Which is why they are imposing regulations on those kinds of things. Just like steel shot in shotgun shells.

>>1121696
Boat keels are lead FILLED. They have an epoxy coating on them. At least the boats I've owned/worked on are that way.
And yes. It does leach as lead monoxide. And yes. Lead monoxide is hazardous to the environment. And no, it isn't reclaimed quickly (at least on the human timescale.)

>>1121309
We need a counter weight for that little one

>>1121720
Mfw all i want in life is keels to make dicks from.

>>1121726
https://youtu.be/VZpUhGj5ogM

>>1120367
>the buckets with water for free
What's happen if the buckets are closed ?
Still weight nothing undersea ?

>>1121726
did you take a screen shot of a picture?

do you have brain damage?

>>1120822
You want to have the air leaking from the lowermost part. If it leaks from the top you are fukd.

>>1121609
My oh boying is because I believe these "put waata innit!" people are trolls trying to trigger people like you. Nobody is so retarded that they think water can be used as a weight in water...

>>1121651
>This includes having an open underwater entrance.
Another "oh boy".
Soon I'll run out of oh boys!

>>1121746
it's weight nothing because water have the same density of ... Water... ah ah even closed will change nothing, it would have work on oil or other light density liquid.


At this deep, I think you can have a windows, but take a good thickness of plexi, or a little bit paneled glass.
You will have a lot of condensation, (of course), and the container will have corrosion problem, even with a good paint and treatment on it. Your space will be reduced, but have you thought about isolation ?

I ask my friend who's ingenior in boat, and he told me :

-You definitively need an anchor, like the mushroom one, 6 or 8 of them.
-You're fine with the compressor and air presure, BUT don't take any cheap compressor because you need a very good oil and air filter, to keep good air insuflated.


Good luck for your project, I'm grantly interested also.

>>1121793
Also, my friend recommand you to look the movie "The Silent World"

>>1121042
Sandy is the same size as a chimpanzee, but SpongeBob doesn't really into consistency.

>>1120810

t. Bond Villain

>>1121527
Or, he could put the anchors in first, then winch it down.

>>1121761
You're giving them too much credit. If you haven't noticed, the board is full of people with the narrowest possible understanding of physics acting like they have a doctorate in any and all subjects related.

>>1121764
They're just trying to feel smart by joining the "shipping containers get crushed" band wagon.
My personal gut feeling tells it's going to deform horribly and tear at the seams without additional reinforcement.

>>1121761
>Nobody is so retarded that they think water can be used as a weight in water.

You seem to have forgotten where you are.

>>1120012
>a thousand cubic feet of sand
More like two thousand.

cu ft sand = 100lb
displaces water = 62lb
net gain = 38lb

>>1119992
Pretty sure you could eliminate the lead shot if you found a sunken ship to anchor to. Probably could make a real nice underwater bodega for divers to visit.

>>1120624
lol what a mean thing to say

>>1120007

The only logical answer

>>1121798
>Sandy is the same size as a chimpanzee
Those chimps had shrunk down for the visit using another bit of mad science they'd funded. Full-size chimps using a squirrel-size air lock? That's just silly.

>>1119992
A box shaped underwater shelter is a bad idea, flat sides are prone to crushing.

What you need is a dome, domes can stay up with minimal supports.

>>1120011
This is retarded. Create an anchor point in the bedrock and attach your shipping containter to it with cabling.

>>1120027
The retard is strong with this one

>>1122008

Read the thread. It's ambient pressure. No pressure differential means the box shape is not a problem. The only stresses on the structure are buoyancy related.

>>1120808
>Good movie: All is lost

Clearly not a sailor. I thought it was good, too, but the character makes some unrealistically stupid decisions and is ill-equipped from the outset.

>>1120505
Did someone say additional pylons?!

>>1122038
Not evert place has bedrock close to the end 8f the sea and beginning of the bottom

>>1122354
Shut up Aldaris.

https://www.youtube.com/watch?v=qczsqBJuDRQ

A fucking bag works

>>1120879
Make sure that the chain attached to the mushroom anchor has a variable length.

Oh look, another fucking moronic pipe dream that will never be realized.

Getting very fucking bored of these autistic posts by losers with unrealistic dreams.

It's not DIY if the D never happens.

>>1122595
and you, what's your dreams ?

>>1122595

>It's not DIY if the D never happens.
sounds like something to sell viagra to lonely people

also if you have to ask for help, its more than just yourself isn't it?

I actually work with a metal worker that does a lot of stuff locally and around the us with shipping containers and apparently they leak and they leak a lot and it's nearly impossible to keep them from leaking

>>1119992
Well, top marks for cool fort idea. My inner 9-year old loves shit like this.

However:

- Shipping containers can't withstand much pressure at all. If you've browsed /diy/ for more than a week you should know this.

- you didn't include the mass of the container and other internal objects in your calculations. You wouldn't need that much shot.

- I understand the principle of how those water-air locks work, but how sensitive are they to changes in ambient pressure? Like due to heat/cold changing the volume of air inside? It would be no fun at all to dive down during a nice warm day, get into bed, and wake up to a foot of water because the temperature dropped ten degrees overnight.

- why bother with a septic system? That's almost certainly more harmful and polluting than just letting your turds float into the lake.

>>1120018
You think Bunkerbro has trouble picking up women...

>Hey babe, let's do some Netflix and chill at my place... here, put on this wetsuit

>>1120032
>compressor fails
>no fresh air
>op is going to suffocate
>old air is replaced by water since air now has an escape path
>op develops gills
>op lives rest of days as fish
I like this plan.

>>1120366
With mud-anchors. Jeeze, some people need everything spelled out for them.

>>1121694
Reverse watery parachute happens to be me and my wifes favourite kama sutra position

>>1121761
You should anchor it by freezing the water in the buckets. This turns it into ice, a solid, which is denser than liquid. And since heat rises, therefore cold sinks down, further anchoring the ice weights to the bottom.

You're welcome OP.

>>1122724
>This turns it into ice, a solid, which is denser than liquid.
And this is why ice-cubes/icebergs never float.

>>1122724
what i think you meant

>since water expands when it freezes thus becoming less dense. OP should have multiple shipping containers filled with water acting as ballast which are refrigerated to 4 degrees Celsius, the temp which water is at its densest.

>>1122607
flex seal would work

>>1120068
The water column weight has to be considered, not only the pressure difference, wich I don`t think will be as constant as you think it is.

>>1122604
You got it, mate.

>>1122599
That's my point, dumb-ass.....

DIY stands for Do It Yourself. Not fucking Dream It Yourself.

OP is talking about actually doing this, yet we all know it will never happen, and that OP is just some fucking neckbeard autist that will likely never leave his basement.

>>1122889

and you, what have you did ?

>>1119992
Prepare for fucking leaks everywhere. Every underwater vehicle or structure fucking leaks.

>>1122912
>and you, what have you did ?

Not him, but I use containers for shop space. Your question is stupid because "doing shit wrong because you are too lazy and/or insane to do it right" is not better than not doing it at all.

Many people who might make decent /diy/ers choose stupid projects and cannot be talked sense to because they are autists. That sort of loser ends up building bad plastic and wood geodesic domes the fall apart in storms...

OP is beautifully shitposting and I enjoy his drawing. No one serious would be remotely interested in doing it as described but it's fun way to smoke out the idiots who think he's not trolling.

Good job, OP! Best shipping container troll image so far. (e-salutes)

>>1122993
Also shows how the majority of /diy/ mostly ignores the actual questions and just spews out meme responses.
shipping container = crushed and physics be damned

>>1120011
Why not drive a bunch of rebar into bottom of the lake. Flood the container to sink it. Bolt it to the rebar. Then pump the water out.

>>1119992
is this part of your plan to teach objectivism to rodents?

wew lads

The lead shot would have air gaps, too

>can't work - water pressure will crush the container

attach item to airtight FABRIC lift bag
allow air to enter OPEN bottom of bag
bag inflates and begins to lift attached items
release bag
bag rises and encounters lower water pressure
excess air escapes through OPEN bottom of bag

The bag is not crushed and does not explode because the inside and outside are at near the same pressure at all times.

>>1123234
should have used pic related instead

>>1123234

most of the people here haven't even try to do it with a glass in a pool....

>>1121727
Bless you anon...

>>1121752
Mfw i am not cutting my resolution down to apease hiro. Screenshot under 4mb. But yes, i may have lead poisoning

>>1122008
Jesus.


Wayne incomming.

>>1122354
Alderis no.

My life for aire.

I have in my lifetime constructed enough additional pylons south korea is pleased.

>>1122595
Kek.

He wants the D...

>>1122617
10/10

>>1122744
Lolololol.

This thread.

Every week until u like it.

>>1123084
Physics be damned.

>helicopters
>bumble bees
>shipping containers

>>1120506
You'd probably want to set up one way valves on the pumps, so that if they fail or the line fails you won't have your air rush out

>>1122912
If you can't speak proper English then I'm not entering into a debate with you, as it would be too easy to discredit you, and I'm not cruel.

>>1123236
Obvious photoshop, everybody knows niggers can't dive.

>>1123482
>He wants the D...
>insert /co/ meme here

>>1122005

Joey, bring up the video of that chimpanzee...yeah that one. You see the size of that thing? That thing must be 400 lbs! It would tear you to pieces! Crazy. Some people keep them as pets, did you know that? They must be insane. I heard a 911 call of a lady who was watching her pet chimp rip her friend's face off right in front of her and eat it. Some people are fucked. Anyway, back to that underwater city you were talking about...

o i am laffin

>>1121178
Acually a decent suggestion here. Not for all the ballast though, container would tip over.

https://www.youtube.com/watch?v=eHxJRgZ_elA&feature=player_embedded

https://en.wikipedia.org/wiki/Continental_Shelf_Station_Two

Ichthyander Project

https://crimeanblog.blogspot.ca/2011/08/blog-post.html

>>1119992
For weight, factor in the weight of the unit itself too, and what's inside. Also remember youre not beating air at 1atm, but more than that if you plan to have the unit pressurized

>>1119992
I'm assuming you're a diver? For the cost of the lead shot I would suggest buying another shipping container. Sink it where you want it, then get one of those sand pumps they use to clean out ponds and shit, and fill it up. No idea what the weight will come out to, but I'm sure you can figure that out. It also gives you a better base to tie in to than 5 gallon buckets which could break.

>>1121302
Best post of the thread

>>1119992
This is the best thing since the guy who wanted to build a tunnel and probably died. Please youtube it.

Probably noobie iditotic questions, just firing them out:

1. Are shipping containers airtight enough to be supplied by an airpump?
2. Wouldn't they rust relatively soonish, therefore loose air like fucking nuts?
3. Wouldn't any windows be really really risky even if you equalize pressure with relatively low budget solutions?
4. What if you put it on top of some sort of fundament you poured, which would even it out and help sink it?
5. Couldn't you just put basically a tub of concrete, as flat as possible, on top until it sinks? While obviously watching for it not pancaking, maybe in addition to some sort of weight-y fundament-y kinda thing...
6. Wouldn't in general putting the balast inside (somehow) on the sides (somehow) or on top (partly and somehow) be better than tying it under it? what if the rope breaks on one side? wouldn't it basically shoot the the surface at a vaguely 45-ish degree angle? I know it's just 21 feet and not from the bottom of the mariana trench... but still...

>>1124515
>1. Are shipping containers airtight enough to be supplied by an airpump?
No, but the door(s) could be welded shut and gaps sealed with silicone caulk
>2. Wouldn't they rust relatively soonish, therefore loose air like fucking nuts?
It would likely take several years for rusting through to cause problems
>3. Wouldn't any windows be really really risky even if you equalize pressure with relatively low budget solutions?
A glass window may not be a great idea just because of impact or warping but plexiglass with some bars across inside and out would be safe
>4. What if you put it on top of some sort of fundament you poured, which would even it out and help sink it?
It would still require the same amout of weight whether is was concrete or lead. OP is looking for the least expensive ballast.
>5. Couldn't you just put basically a tub of concrete, as flat as possible, on top until it sinks? While obviously watching for it not pancaking, maybe in addition to some sort of weight-y fundament-y kinda thing...
Having it 'top heavy' while underwater isn't a great idea. (flips over, fills with water and is stuck on the bottom on it's side or upside-down)
>6. Wouldn't in general putting the balast inside (somehow) on the sides (somehow) or on top (partly and somehow) be better than tying it under it? what if the rope breaks on one side? wouldn't it basically shoot the the surface at a vaguely 45-ish degree angle? I know it's just 21 feet and not from the bottom of the mariana trench... but still...
(somehow) isn't really a solution. There will be many ropes/chains/cables holding it down. If the status is checked regularly the likelyhood of catastrophic breaking and release is minimized.

>>1119992
Be sure to seal and check various parts of the container if you're going to sink it. Plus, I'm not sure how long most containers will last underwater. You'd need to seal around all the bolts and you'd need somewhat more of a stable base as to not let the cords rip.

>>1122889

NOTHING WRONG WITH DREAMS

YOU FUCKING TERRORISTS WAGING WAR ON IMAGINATION

what OP should do is get 3 shipping containers

Put 2 on the bottom as ballast, offset slightly to allow his bottom hatch. weld them together and sink them once resting on the bottom fill them with rocks/sand, then pump out the top container and introduce air

This way it gives OP more space to fill with cheaper ballast and provides a stable base so his tomb doesn't flip

>>1124603
I sort of approve of that, however, on a wild hunch here, if he has basically no budget, two extra shipping containers might break the bank a bit... also, that would raise the whole thing a bit too far from the floor for someone who does the whole thing in order to live under the sea. If he had equipment to bury those shipping containers plus the budget, sure.

>>1124610

That dude had a good point... Others have also said it.

Op needs to use the sea floor as ballast

>>1124610

He certainly is bitching about the cost of lead shot, another 2 containers aren't nearly 90k

Better be careful that your umbilical doesn't get damaged.

https://www.youtube.com/watch?v=pRC5R1jRO58

>>1124624

>>1124628
It wouldn't be quite as brutal as that video, as he has an opening in the base.
But he would get quite wet in a hurry.

>>1121651

Been a while since I took physics, but wouldn't the internal pressure from the air be the same as the external pressure form the water if it had an open bottom? Else wise water would just fill the container and compress the water until it balanced out.

>>1120007
how do you fish inside of that?

>>1119992
Would you kindly?

I think the metal would fail relatively quickly. these fiberglass water tanks would be a better option.

>>1124687
I might be out of my depth (har har) again here, but those look pricey, the man can't afford lead. In principle... if you could put them on their sides... secure them with ankers, you could even try to fill it evenly with concrete so you'd have a level floor.... *think think think*.... but that seems a bit above this project-

The man wants to be the low budget Andrew Ryan, just that this guy will probably drown instead of what happened to Ryan.

Sidenote: Man, that Bioshock book was a hot garbage fire, jesus christ, this weird thread brings me back to some of the worst 5 bucks I ever spent. And I loved the game(s)

>>1120360
the acoustic effects must be crazy as fuck

>>1124687
similar idea, make your own fiberglass house under the sea. It's fairly easy and cheap to diy fibreglass and there's tons of YouTube videos on it from boat builders. Hell OP could build himself a small boat to get his underwater hideout further from the lake shore, especially if he can find a topographic map of the lake floor and find a shelf in the middle somewhere

>>1121793
>i ask my friend who's ingenior in boat

your svenska is showing

>>1122541
until it slides, breaks and you go into fucking space

>>1125182
>breaks and you go into fucking space

This made me wonder:
If I took/sent a two liter soda bottle (upside-down, no cap) to a depth of 1000 feet deep and released it, how high would it go when it surfaced?
Would it go to the same height if I only took it down to 25 feet?

>>1125207
you should probably use something more hydrodynamic like a completely round object with low friction, the first thing that comes to my mind is a tennis ball coated in some sort of plastic or maybe inside a balloon or a condom

>>1125217

>>1121097
Mcfucking kill yourself you retard

>>1125207
I don't have any math, but did a fair amount of swimming and my intuition says it would be no faster after a few feet

>>1119992
>Container gets a small leak
>Air escapes at high rate
>Container undergoes explosive decompression

>>1125207
>Would it go to the same height if I only took it down to 25 feet?
Yes. Or the same height as a foot or two. Water resistance is enormously powerful, and the buoyancy force of a 2L bottle is being applied to a relatively large object. Equilibrium speed is slow until the top breaches the water, and then it just pops up a bit.

Just do this but make it X times bigger for yourself to live in anon. simple!

https://www.youtube.com/watch?v=ymeAWKXdafM

>>1124593
I like dreams, but they need to go on /dreams/

>>1125207
Without fins:
>Bring bottle down to 1000 feet
>Air inside compresses
>Displacement is reduced
>Release bottle
>It starts to ascend
>Initially, buoyancy remains at the top (err, bottom) of the bottle while drag remains below, keeping it bottom-end up for most of the ascent
>Ascent is slow at first, then accelerates as air inside decompresses and buoyancy increases
>Air continues to expand, and as the bottle approaches the surface, fills the majority of the bottle's volume again
>Center of buoyancy falls to the same height as the hydrodynamic center, and the bottle becomes unstable and begins to tumble
>Bubbles spill out the neck of the bottle
>Bottle loses most or all of it's buoyancy and slowly drifts the rest of the way to the surface, without fully clearing the water

But, for curiosity's sake, let's consider a case where that doesn't happen. if the bottle has fins on it to keep it aligned bottom-up and ensure air does not escape, odds are it will be very near terminal velocity when it does reach the surface, which we can estimate.
2-liter soda bottle:
>Displacement: 2 liters (duh)
>Diameter: 110 mm
>Drag coefficient: Approx. 0.3, let's say
>Density of water: Approx 1 kg/liter
>Buoyant force = drag (because terminal velocity)
>Buoyancy near the surface: ~20 N
>Terminal velocity @ above conditions: 3.75 m/s, if I did my math right
>Height reached upon breaking the surface: ~72 cm
Yeah, water is draggy and dense.

>Would it go to the same height if I only took it down to 25 feet?
Pretty much.

>>1125824

Thanks

>>1125824

I don't think so, Tim.

I'd bet the pressure on the bottle is so high it makes it not buoyant at all.

Kinda like how a scuba tank will sink if you throw it in the water.

The bottles mass and air content stays the same while buoyancy is reduced by the water pressure.

>>1126089
You're forgetting that scuba tanks are made of super heavy duty steel to deal with pressurized gasses. An empty/water-filled plastic bottle will float by itself, even without air in it

>>1126089
1000 feet is 31 atmospheres absolute. So at that depth, the air inside the bottle still displaces 1/31 of a liter, or 32 mL, of water, and thus produces 32 grams of buoyancy. The PET bottle itself weighs about 42 grams at a density of 1.38 g/mL, for a net buoyancy of minus 16 grams; and the air itself weighs about 1.2 grams.

I'll admit, it's closer than I initially thought, but the bottle still has net positive buoyancy at 1,000 ft, and you would have to drag the bottle down to (only) 2,000 ft in order for buoyancy to become net negative.

>>1126093
Aluminium tanks do float when they are 'empty', meaning when they contain air @ NTP. As do some new steel tanks. I have a couple of 12,1kg 12L Scuba tanks. But the valve might break the equation,cant tell how much that weighs.

>>1122617
Just tell her she has to take off her clothes to get in the house, you dont even need a wetsuit

>>1122615
>- Shipping containers can't withstand much pressure at all. If you've browsed /diy/ for more than a week you should know this.

You do not understand as much about underwater habitats as you believe. There is no pressure on the structure because the air inside is the same pressure as the water outside. This is how there can be an opening in the floor without the water rising to fill the inside.

>- I understand the principle of how those water-air locks work

Then why do you believe there is any pressure differential involved?

>- why bother with a septic system? That's almost certainly more harmful and polluting than just letting your turds float into the lake.

Humans eat a lot of things that are toxic to sea life. Human waste in sufficient concentrations can kill fish.

>>1122629

What is a check valve?

>>1124416

This is what occurred to me too. The lower container would actually only need to be like 2/3rds the volume. But a full second container would very securely fix the structure where it is, which would be good against storms.

>>1124683

Through the floor opening. Like ice fishers

>>1127391

>>1123154
>Then pump the water out.
Pump water out.
Gets filled with more water.

>>1120032
>air compressor up top that maintains pressure
>process of sending a continuous flow of fresh air down.
I hope you realize that there will be a mass of air bubbling to the surface at all times, and if there isn't you'll suffocate.

>>1120367
Technically it does, it just doesn't have enough weight to counteract the buoyancy of air in water.

>>1120656
No he doesn't. If gravity is acting on the water then it weighs something. It FEELS like it doesn't weigh anything in water because the external water is counteracting the force of gravity.

For example, the air around you has a weight. When you step on your scale, your scale is calibrated to zero with the air pressing down on it. This means that the zero point is actually the weight of the column of air on it. If the scale was zeroed in a vacuum it would read the weight of the air.

>>1127502
>he didn't even look at the OP pic before posting
gg no re

>>1127506
>If the scale was zeroed in a vacuum it would read the weight of the air
The device you're trying to describe is a barometer, not scales.

And just for fun... If something FEELS like it weights nothing then it indeed does not weight anything. Weight is not the same as mass.

Scuba diver here. You can't stay at even shallow depths forever if you're pressurizing the container. Nitrogen narcosis will set in after a couple hours. You'd have to keep the container at atmospheric pressure, which means reinforcing it and building an airlock.

>>1127828

First, you can indeed stay at moon pool depth 21 feet or shallower as long as you like. You will take on some nitrogen but not enough to be dangerous to you when you surface.

Nitrogen absorption does not just continue until you're fully saturated when you're at any depth. You only take on as much nitrogen as there is air pressure to force into your blood.

Also you appear somewhat confused about what nitrogen narcosis is and the depths at which it sets in.

>>1127620
>If something FEELS like it weights nothing then it indeed does not weight anything.
Weight is the force of gravity acting on an object. The object still weighs something, it's just that another force is counteracting the force of gravity. Go take a basic high school physics class, maybe you'll learn something.

>>1127620
>The device you're trying to describe is a barometer, not scales.

A barometer is a scale that is calibrated to a vacuum. Hence why the first ones used a vacuum (as close as they could get it) and a liquid. A traditional scale calibrated in a vacuum would measure the same thing.

A traditional scale works by counteracting the force of gravity of an object until it moves into equilibrium. Gravity acts on air (all matter actually), the reason why it doesn't measure air is because it's zeroed with the air weighing down on it. Remove the air, rezero the scale, bring it back to the air. GUESS WHAT IT WOULD MEASURE? That's right, the weight of the air above it.

>your logic
Buy a digital scale. Put a weight on it. Zero it. OMG the weight has no weight!!!!
>is so stupid

I hope you get that through your head, because I can't help stupid.

>water doesn't weigh anything in water
does gravity act on the water still?
Yes.
Then it has weight.
Is it accelerating?
No
Then there is a force (normal force) counteracting the force of gravity.
You literally learn this in high school physics class.

>>1125824
For reasons completely unrelated to OP fucking local sluts at atmospheric pressure while seals watch, is there a formula you used to determine height, etc? Is 72cm clearing the water or just the top of the bottle poking out?

>>1127506
>For example, the air around you has a weight. When you step on your scale, your scale is calibrated to zero with the air pressing down on it. This means that the zero point is actually the weight of the column of air on it. If the scale was zeroed in a vacuum it would read the weight of the air.

The air pressure will make no difference since it operates above and below the scale pan.

To prove this point, Put a spring balance under water where the pressure is higher, it wont change due to pressure, try it at the top of swimming pool and at the bottom, the reading will be the same.