Unlike humans, many species of fish are able to survive the pressure of the deep ocean. Deep-sea fish can survive this pressure because there is a negligible pressure difference between their insides and the water. In other words, they don't have any spaces full of air to be crushed. A gas-filled organ often found in fish, a swim bladder, is missing in deep-sea fish. Without this bladder, deep-sea fish do not have to worry about being crushed.
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