What about a reverse parachute? Would this take you from the

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>>8709679
>would it work above ground with lighter than air gas

>>8709706

Those are a little big though

>>8709679
Wouldn't you die from caisson disease?

>>8709728
Difference between densities is smaller so you need higher displacement.

>>8709731
If you were in a one atm suit or a low depth you'd be fine

>>8709740
What if I was wearing butt floss like the gal in OP's image? Would my buttocks rupture?

>>8709748
Severe decompression sickness yes

>>8709679
You mean a balloon? I don't think so. I'd imagine at the bottom of the ocean the pressure would collapse the balloon as soon as it formed. This is supposing you could get it too form in the first place.

I guess you just increase the pressure in the balloon until it was stabilised against the pressure outside, but that seems impractical coming from the very bottom of the ocean.

>>8709679
>Would it work above ground with lighter than air gas?
https://en.wikipedia.org/wiki/Fulton_surface-to-air_recovery_system

Although technically the lifting for this was done via plane and not gas. The balloon only pulled up a line for the plane to snag.

>>8709752

I thought the pressure would be an issue too, but I believe so long as t pressure inside the cylinder is higher than the pressure outside, it will cause bubbles to escape. If its enough to fill the balloon you should rise if your buoyancy allows it.

As you rise the gas will expand and bubble out the bottom.

Amirite?

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>>8709679
Gee, I don't know, anon

Balloon would either explode as depth decreases, or would send you up like a rocket, making your lungs pop.

idk mayne

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>>8709679
Research submarines do this. In case of emergency the entire lower hull can be jettisoned, which allows the upper hull to shoot to the surface.