And what about people like David Blaine or Tom Sietas? Sietas held his breath underwater for over 22 minutes (world record). I know they train for it like months and even years, but doesn’t holding your breath = no oxygen to brain?
Permanent brain damage apparently occurs just after 4 minutes of lack of oxygen to the brain, so why are freedivers left generally unscathed after 8 or 10 minutes without air?
In: Biology
They are literally holding breath.
Some people have a weird thing they can do where they basically close their throat, but can still pull air into their mouth and then force cheekfuls of air down into their lungs so they end up with way more air in their lungs than is normal for breathing.
Enough for 20 or more minutes, if they also work on doing things that make them use less and less oxygen.
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