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this post was submitted on 22 Jun 2023
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So, I understand that because water is not compressible, animals without air in their bodies are safe at such high pressures in the deep sea, but what I'm wondering is what would it look like if a human in the deep sea was suddenly exposed to those pressures, as would happen if a submarine rapidly pressurizes? I know the lungs would collapse and whatnot because the air would be pressurized into I'm guessing a liquid, like how propane sloshes when under pressure in a tank, but what else? What causes the instant death? Maybe the water shoots into nose/mouth so fast it acts like a bullet and applies a bunch of force to the walls internally?
These are styrofoam cups that've been crushed by the pressure at the bottom of the ocean. The water isn't looking for your nose, it'd just crush your outsides into your insides until you hit a relative density, like the cup, but not as pretty. The air in your lungs would instantly compress and heat to several thousand degrees C, turning your insides back into your outsides. I think.
Holy shit and all of that happens within 2 nanoseconds I think? So that's why the victims in that submarine wouldn't even know it already happened because our brain takes 4 nanoseconds before we could process that pain.
There's a big chance they've all passed out from lack of oxygen by the time this happened. It's instant death either way.
I wonder if this is truly correct. By default human body is mostly water and made of things deniser than water. If water rapidly flows into the submersible, that might compress the air inside and cause the lungs to explode basically from the pressure differential in the chest cavity? Styrofoam in contrast is less dense and compressible.
You can take this with a pinch of salt, but I believe that, based on your mention that the human body is mostly water, our bodies, down to our last cells, also have this internal pressure from the water in our bodies. The water is not compressible, but tissue is. And that would mean that not only our lungs will explode, but our entire cellular structures. It would be like squeezing oranges or lemons
But tissue is mostly water with some solutes and a lipid membrane. I don't think the cellular structure would implode. There are gelatinous animals in the deep sea with cells and such. But any cavity would implode. Lungs, thoracic cavity, digestive system, abdominal cavity, even the small pores in your bones if they aren't packed full of equally dense liquid (not sure on this).
Ah okay that makes sense.
Do take what I say with a grain of salt, but my late night napkin math says that (assuming a now rectangular human that's 16 inches wide and 72 inches tall) a person should have a frontal surface area of 1100 inches, under 6000psi, that'd be about 6,800,000 pounds of pressure on them - instant death.