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I am not saying this is the answer to much of anything. But there is occasionaly a "burp" of gas release, when a warm stream of water hits one of these veins of methane hydrate, which is found at a depth of 1,000 feet or more. Ocean temperature at that depth is normally 4°C, or about 38°F. Water is at its most dense at that temperature, and methane hydrate is a stable amorphous solid. A flow of water that warms the temperature by only a few degrees results in the methane hydrate destablizing, and turning into a gas, escaping to the surface. This huge "burp" results in a gas-water mixture of temporarily much lower density than water alone, which may explain mysterious disappearances of ships and boats in places like the Bermuda Triangle. The warmer Gulf Stream warms up the water at greater depths, and the methane hydrate breaks down. The buoyancy of the sea is momentarily reduced, and the vessel sinks, like a rock.