Pressure builds, lungs shrink

​I rarely read book reviews but I stumbled across an interesting factoid in a review of One Breath: Free-diving, Death and the Quest to Shatter Human Limits in the Jan 27/16 issue of The Economist: “At 20 metres, the body loses its buoyancy. Pressure builds, the lungs shrink, gravity exerts its pull. The diver goes into free fall, carried ever deeper away from light and into blackness.” (The physics are dramatic but in the back of my mind I’m visualizing Sen Marco Rubio.)

A question for the “What if …?” author: How high would a diving board have to be for you to jump off and plunge 20 metres under the surface?​

 

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