If it only takes 4 minutes without oxygen to cause brain damage, how can they stay underwater for 4+ minuets and not hurt themselves.
In: Biology
They start by oxygenating their blood. Lots of heavy or deep breathing. You can have two deposits or oxygen, your blood/body, and your lungs. The lungs are kind of like a the secondary source that feeds the primary source. If you can fill the primary source as well as the secondary source, you can last longer.
Also, they use techniques to lower their heart beat, and thus/also oxygen consumption. Things like meditation. Reduced consumption coupled with increased supply equals longer times.
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