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Even ignoring the oxygen toxicity at this depth the pressure itself is as great as one ton on every square inch of your body. Despite popular belief the pressure won't crush you as the human body is made up mostly of water, which is incompressable, but any hollow cavity in your body that isn't filled with water will be compressed and eventually collapse or rupture. Even at much lower depths your lungs, ears and sinuses will be compressed to the point where it's not only painful but also extremely deadly.