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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If you have no source of fresh oxygen, you’re doomed.
Why? Because when you breathe in oxygen, you exchale carbon dioxide, which is something we cannot breathe. Carbon dioxide will fill the space, and since there’s no more oxygen, eventually you’ll die.
Anything below 70% oxygen saturation is life threatening
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