How do animals that go to the ocean surface and also dive, like whales/seals/penguins/etc not have their ear drums burst under the extreme pressure that they dive down too?
Animals like fish and such, to my knowledge, do not have ears, so it makes sense that in the deep sea there are fish/cephalopods/jellyfish/microorganisms, but what about those with ear drums?
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Eyes are filled with fluid, not gas. Fluids are pretty much uncompressable. They change in volume negligibly under pressure. Marine mammals have to control their dives the same way humans do in order to prevent dissolved gasses from coming out of solution in their blood.
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