[HelgaHawk]

..and as you know...farts can be lit up.

[MHGinTN]

Helga, one of the men who nailed the existence of huge fields of methane hydrates used to do investigations of oil rig collapses, ocean-going rigs. He found the twisted wreckage of more than one rig to be severely burned and melted due to ignited methane. The hydrates don't release their methane molecules too readily until brought to suface, but below nearly every hydrate field is a gas pocket of anybody's-guess size. [I'm no expert, I use the concept of the surfacing methane in one of my novels so I had to do some research.]