A team of marine experts conducts an experiment to see if gas bubbles can sink ships. The physics makes sense, density is the sole factor keeping things afloat, reduce density of water enough, ship can sink. Lets also not forget the scale varies dramatically, and some of these gas eruptions are huge. Airplanes are affected because the methane rises possibly causing a number of problems for plane and crew.
Explaining the Bermuda Triangle, Can Gas Bubbles Sink Ships?