Saw a link to an old Popular Science thing in the SH5 threads.
(Yea, I'm lazy and provide no link. Live with it.

)
UnderGround Coal Gasification is what interested me.
Useing scientific investigative enquires, (Google), I found there's a World Wide Association, (Conspiracy), determined to light fires in underground Coal seams.
Now I'm not sure how people in Pennsylvania feel about lighting Underground Coal on fire, on PURPOSE!
But I can see a big disaster waiting to happen!
Kind of like the Soviets decideing it was a good idea to burn gases off in Turkmanistan.
Shades of an inland Deepwater Horizon!
I mean, what could go wrong?