Comment manure pit (Score 3, Interesting) 591
Death by nitrogen is the ideal way to die. It's so effective it's one of the dangers in nitrogen inerted buildings. You don't know you are dieing you just pass out. SOmeone comes along sees you down in the room and tries to rescue you and bang they keel over too. It's the classic farmer manure pit death.
the key here is that your urgent need to breath oddly enough is not triggered by lack of oxygen but by build up of CO2. when you remove the O2 from your air then you don't notice it because your alarm system isn't triggered. You are still getting rid of the CO2 in your blood.
Why nature rigged it like that I have no idea but it is easy to see that under almost any normal condition the two are linked making having separate sensors of O2 and CO2 not needed so why evolve one.