A tiny spark. Thats all it takes.
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Not because of scientific accuracy, just because this is a random save
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Okay, I feel the need to be super pedantic about this; a tiny spark or even a more significant ignition source won't burn pure hydrogen gas- hydrogen is only extremely flammable in the presence of oxygen, so as long as there isn't a leak in it's container, hydrogen should be relatively stable... Anyways +0