system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do animals that live in the very deep sea, where the pressure is incredibly great, survive the pressure of the water?
gpt
For the same reason that you can survive the pressure of miles and miles of air pushing down on you: their internal pressure is identical.

All the water inside of their body is at the same pressure as the water outside of it. The water inside pushes out just as strong as the water out pushes in, and the forces equalize. In the same way, the air in your body is at the same pressure as the air outside, and so the forces equalize. That is why they disintegrate when brought to the surface: The water inside depressurizes, and bursts out of their skin and their cells. A similar, though less drastic, phenomenon happens to us if we go into a vacuum, because our body's air is pressurized at 16 psi.