Comment Re:Like on airplanes! (Score 1) 591
I know that statement was made as a joke, but in all seriousness nitrogen is the least expensive non-toxic asphyxiating gas (meaning something that isn't toxic but doesn't contain oxygen) there is, due to it already being 78% of the air. Breathing pure helium would do exactly the same thing, but helium is a lot more scarce, and thus more expensive.