Interestingly, this isn't what happens when you breathe air without oxygen. Our sense of suffocation is tied to levels of carbon dioxide, not oxygen. When breat

Interestingly, this isn't what happens when you breathe air without oxygen. Our sense of suffocation is tied to levels of carbon dioxide, not oxygen. When breathing an oxygen-free inert gas, you pass out and die after a few breaths without any panic at all. See https://en.wikipedia.org/wiki/Inert_gas_asphyxiation https://en.wikipedia.org/wiki/Inert_gas_asphyxiation