[hbbio]

Reminds of Chris Lemons, who survived for 30+ minutes without oxygen at the bottom of the North Sea. Cold water (and experience, like staying calm) probably played a large part. He went back to diving a few weeks after!

They made a movie about it: https://en.wikipedia.org/wiki/Last_Breath_(2019_film)

[js2]

He was saturation diving on Heliox. From this reporting, it sounds like his heart didn't stop:

https://www.bbc.com/news/uk-scotland-north-east-orkney-shetl...

He's a public speaker now (probably much less risky; I'm sure his family appreciates that):

https://www.chrislemons.co.uk/