It ’s astonishing to me that professional free divers can hold their breath for 15 or 20 minute while swimming into the sea ’s depth . It ’s even more amazing that , sometimes , they push themselves so hard that their superhuman cause end in their own death . Robert González explains how they do it in io9 .
Bonus : here ’s a favorite free diving video of mine .
https://gizmodo.com/the-secret-to-holding-your-breath-for-20-minutes-1542451520
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