[BigCinBigD]

Maybe a large enough amount of natural gas escaping from the ocean surface in a concentrated area. Could cause aircraft engines to stall or perhaps loose lift and cause crashes? Or maybe even...Explode! There I want a grant to study this some more... ;O)

[piytar]

Actually, what it does is lower the density of the water (and further disrupt the surface tension), so the ship simply goes under. The underlying physics is well understood, and frankly pretty basic.