Deep-sea diver was cut off from his air supply for 25 min. He survived

[colinprince]

https://www.cbc.ca/lite/story/1.7487922

[EA-3167]

These stories only ever come down to one thing: Cold.

"You aren't dead until you're warm and dead."

[evanjrowley → EA-3167]

Does being under "deep sea" pressure also mean greater quantities of oxygen in the blood?

[EA-3167 → evanjrowley]

All things being equal it does, although the mix that divers breathe is tuned to account for higher partial pressures to avoid Oxygen toxicity. Even then I believe the pressure still leads to higher saturation of all gasses, oxygen included.