Wasn't there some notion that this was possibly the cause for the disappearance of planes and ships in the Bermuda Triangle?
I’ve heard the same thing, but not for planes, just ships.
Here is a link to a site with a number of articles about gas hydrates and methane eruptions which could explain some disappearances in that area.
One particular article attempts to explain the downing of flight 800, global warming, and methane as a resource to replace heavier hydrocarbon fuels (Sort of). Pretty comprehensive and suited to the tastes of many on this site!
http://www.science-frontiers.com/sf111/sf111p09.htm
“Gas-hydrates are unimpressive when brought to the surface — just dirty, fizzy ice. However, taken together, they contain more carbon than all the world’s oil fields, perhaps much more. Most estimates fall between 1,700 and 11,000 billion tons, but there is one scientist who pegs these cold-storage carbon deposits at 4,100,000 billion tons. In comparison, human releases of carbon to the atmosphere via the burning of wood, gas, coal, and even the collective flatulence of all the planet’s animals are trivial.”