In simple terms, it’s because there is equal pressure all the way around the wreckage. Whatever water pressure is pushing against one side of the hull is equal to the water pressure pushing against the other side of the hull. When you see things like a film in which a submarine implodes at great depths, it’s because the air pressure inside is less than the water pressure on the outside. But the Titanic no longer has any pressurized compartments–it’s surrounded by equal water pressure on all sides.
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