What I love about the whole situation on this gas is that people talk as if they have or will be able to smell it.

Natural Gas/Methane is odorless. Meaning that if you walk into a confined space with a high enough concentrate of it you wont know it until it's too late.

Gas companies add a chemical to it called "mercaptan" which is sulfur based and thus makes the gas smell like rotten eggs.
They add this so that one knows they have a leak present.

If you went out to the sink hole you wouldn't be able to smell the gas at all, because it's unrefined and straight from the source.

If you do smell anything at all it's from the rotten earth being "stewed" up.