February 12, 2012 4:23 PM Subscribe
At 300 feet, the pressure is so extreme that your lungs shrink to the size of oranges and your heart beats at less than half its normal rate to conserve oxygen. You lose some motor control. Most of the blood in your arms and legs has flooded to your body’s core as the vessels in your extremities constrict. Vessels in your lungs swell to several times their normal size so they won’t be crushed by the incredible pressure. Then comes the really hard part.
[Open Your Mouth and You're Dead
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