Ven. 24 Dec. 2004, 11:02
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Citation :On old, stagnant shafts, you might find a concentration of methane in the shaft. Methane (CH4) is lighter than air per unit volume and displaces oxygen, so it floats to the top of shafts with good seals, after flowing along the ceiling for any distance. Drop a lit match into it, and stand away from the shaft collar. The match may go out since the methane will not support burning without oxygen mixed in with it. If it ignites you'll get a WHOOMP! and a flame, and I would advise you to seek other entrances
hock: Methode bourrin...
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