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"Because the pressure will cause the heart to explode."

Well, no (the heart cannot "explode" anyways, rupture yes, but I'll leave it at that for now).

The main problem is the pressure differential on the surface compaired to the lungs which are submerged. At one meter's depth the water adds 0,1 bar of pressure to the atmospheres 1 bar. This means that the lungs which are compressed to 1,1 bar (1 bar ATM and 0,1 bar of water) must overcome the pressure, making breathing impossible since the air cannot be drawn into the lungs.

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13y ago

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