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
It’s a fun little trick called the Mammalian Diving Reflex.
All mammals can do it to drastically increase the time they can spend under water. It’s what allows dolphins, whales, seals and sea lions, among others, to stay under water for so long.
Basically, as far as I understand it, they slow down all bodily functions to use up less oxygen than normal.
With enough training, anyone can stay under water for much longer than what people commonly think is safe.
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