When we suffocate, the reason we feel like we have no air *isn’t* because of lack of oxygen, it’s because of a buildup of CO2 in our blood.
Nitrogen displaces air, so if you enter an enclosed space that has slowly been filling up with nitrogen and pushing out the oxygen, you literally wouldn’t know it until you got lightheaded and passed out. Then you’d be unconscious in a room without oxygen, which isn’t going to end well💀
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