Woke Titan submarine found in pieces
(www.youtube.com)
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Yeah. Typical pressure cooker uses about 1 atmosphere of pressure. This thing probably imploded at about 2-3k feet, so about 60-90 atmospheres of pressure. Air inside would have ignited like in a diesel engine cylinder.
It's hard to mentally process the physics of something collapsing so hard underwater the air inside ignites.
I'm resisting the urge to do my high school science teacher act here, but a perfect Carnot heat engine would use just the ~20% oxygen in air as fuel. Fire pistons can create a flame using just air.