I wonder how marine life can withstand the enormous pressures at the bottom of the ocean without being crushed. The deepest part of the ocean, the Mariana's trench in the pacific, which is about roughly 30,000 feet deep, does have some rather strange-looking sea life inhabiting it. How do these fish survive such deep-sea pressure? Has anyone ever dived to the bottom of the Mariana's trench? Are there even any submersible vehicles that exist that can go that deep without being crushed into oblivion?