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I've never encountered h2s gas around caves or mines, but I don't rule out the possibility. It's most common around pertolium processing facilities and wells. Huge swaths of public land (our land) is inaccessible for recreational use due to H2S dangers.H2s gas can be found in some caves,You'll only smell rotten egg for a couple of seconds,If you're lucky ...It WILL render victims unconsious very quickly,and all would be rescuer's too.