This is pretty stunning. World champion freediver Guillaume Nery dives 663 to the bottom of Dean's Blue Hole in the Bahamas, takes a bow, and ascends. All on one breath.
This piqued my interest about the record for holding one's breath. It's 19 minutes, 21 seconds. As it turns out, there are a couple tricks; one is the diver hyperventilates pure oxygen for about ten minutes before a dive to superoxygenate the body and expel all the carbon dioxide possible. Then into the water, which automatically forces the body to shunt oxygen from the extremities and preferentially to the brain and heart, minimizing oxygen needs.
It should be noted, just in case you're interested in now diving 600 feet without a breath, that scans of the brains of these kinds of freedivers have found abnormalities and there's some concern about the long term effects of very long freedives.
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