Hydrogen should be odourised, so lack of smell isn’t an issue https://en.m.wikipedia.org/wiki/Hydrogen_odorant https://en.m.wikipedia.org/wiki/Hydrogen_odorant

Hydrogen should be odourised, so lack of smell isn’t an issue https://en.m.wikipedia.org/wiki/Hydrogen_odorant https://en.m.wikipedia.org/wiki/Hydrogen_odorant But yes, inherently safe hydrogen either describes an impressive engineering feat or a bad joke.