this post was submitted on 28 Jun 2023
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It's the ocean depths, not the surface of the sun.
Gas is compressible. So if you stepped into the water without any protection at extreme depth, every gas-containing part of your body would be crushed. That includes your nose, mouth, ears, throat, lungs, bowels, and most of the bones of your face.
Liquids are not very compressible. So the liquid parts of your body, like your eyes, brains, blood, and limbs, would not be affected very much. Maybe they would shrink almost imperceptibly. The same is true of the bones not in your face.
The final result would be a an oddly-smushed looking corpse, not a cloud of vapor.
Incidentally, this is why deep sea divers can swim at depth. They breathe very high pressure gas into their gas-containing parts, which thus remain inflated despite the pressure of the water.
It’s not about keeping parts ‘inflated’. It’s about being able to fill your lungs with gas by creating a lower pressure space in them than the surrounding environment. This means more pressure your lungs have to work against the deeper you go. The regulator delivers gas to your mouth at a slightly higher pressure than the water around you, so that your lungs can overcome that pressure difference and you can breathe in. This takes more pressure from the regulator the deeper you go, which also means a higher volume of gas required to fill your lungs. That’s why your tank runs out faster the deeper your dive is.