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Tutorbin76 t1_jdqexgr wrote

Reply to comment by Beheska in TIL of the Bolvano Train Disaster which claimed the lives of more than 500 people in 1944. After the train became stalled in a tunnel, the passengers and crew succumbed to carbon monoxide poisoning when the locomotives attempted to continue and filled the tunnel with smoke. by MorsOmnibusCommunis

That's actually a fascinating/terrifying quirk of human physiology - unless there's CO2 present then so long as you're breathing you have no idea you're suffocating. You just start to feel a bit sleepy and uncoordinated, then doze off and never wake up.

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