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Without wanting to sound macabre, the Oxygen situation isnt the definitive line in the sand that press make it "5 hours of Oxygen left" etc. It isnt on, then suddenly off, it will be a deterioriating linear line after full supply dwindles, similar in many ways to hypoxia from climbing a big...

Interesting video from the company that owns the Titan sub, with footage of previous dives to Titanic. It does look incredible albeit obviously very dangerous.

It's 4km deep too