Methane ice worms living on Earth (Score 5, Informative)

Maybe we should be looking for some life forms similar to these: Methane Ice Worms

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Methane clathrate deposits in the ocean floor have been found to be inhabited by polychaete worms of the species Hesiocaeca methanicola. The worms colonize the ice-methane solid and appear to survive by gleaning bacteria that in turn metabolize the clathrate. In 1997, Charles Fisher, professor of biology at Penn State, discovered this remarkable creature living on mounds of methane ice under half a mile of ocean on the floor of the Gulf of Mexico.