This whole missing submarine has got me confused regarding the limited oxygen. How is it limited and what makes it deadly? How does the oxygen “run out?”
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Humans and living animals are turning oxygen into carbon dioxide (CO2) all the time. CO2 is effectively a poison in high doses and must be gotten rid of in enclosed spaces. It would be replaced with oxygen from some storage tank.
Lack of oxygen will cause humans to initially behave strange, sometimes like they’re drunk… but eventually pass out, enter a coma, and cause brain damage. The brain needs oxygen or it will die surprisingly fast compared to the rest of the body.
This is why giving someone who’s heart isn’t beating CPR as soon as possible is so important, but in the CPR situation the air around us is clean. Inside a sealed up submarine, the air you bring with you is all you really have and it will eventually run out as long as living humans are onboard, and CPR won’t help here.
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