How the hell can some humans hold their breath for 20 minutes?

It's amazing to me that professional free divers can hold their breath for 15 or 20 minutes while swimming into the ocean's depths. It's even more amazing that, sometimes, they push themselves so hard that their superhuman efforts end in their own death. Robert González explains how they do it in io9.

Bonus: here's a favorite free diving video of mine.


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