[djf]

Interesting thing about bacteria. During their life cycle, and when they die and decompose, they give off methane. Bacteria living in the sediments on the ocean floor do it, but because of the cool temperatures and pressure, it binds with water and forms a crystalline compound called methyl hydrate. Looks like ice crystals. Bring it up to STP and it turns to methane.

Estimates are there is over a thousand times more energy in methyl hydrate on the ocean floor than all the oil ever discovered, or ever will be discovered.

[The Red Zone]

Just where did you say this stuff existed? Buried deep below the ocean? Where are you finding natural temperatures on earth cold enough to crystallize methane? (Germ farts LOL)

[Saturnalia]

This happens to tie into a theory on disappearing ships/airplanes.
As the theory goes, a large quantity of gas rises from the sea floor, reducing the density of the air/water, causing the vehicle in question to visit Davey Jones' locker.
Not as cool as Atlantis/mermen/aliens/rabid pineapples but slightly more plausible.