An explanation for some of the disappearances focuses on the presence of vast fields of methane hydrates on the continental shelves. A paper was published by the United States Geological Survey about the appearance of hydrates in the Blake Ridge area, offshore southeastern United States, in 1981 [1]. Periodic methane eruptions are capable of producing ship-sized bubbles, or regions of water with so much dissolved gas, that the water density is no longer capable of providing adequate buoyancy for ships to float. [2]. If this were the case, such an area forming around a ship could cause it to sink almost directly and without warning. Experiments have proven that a methane bubble can indeed sink a ship by decreasing the density of the water.
Methane gas can also crash planes. The less dense air causes planes to lose lift. Also, the altimeter of planes (the instrument that measures the altitude) functions on the density of air. Because methane is less dense, the altimeter assumes the plane is climbing. Planes at night or in the clouds, where they can't see the ground, assume that they are climbing and dive, causing them to crash. Also, methane in the engine throws off the mix of fuel and air. Since combustion engines use controlled explosions, when the oxygen is displaced with even a very small amount of methane, there's no explosion, and the engine quits. All of these effects of methane gas have been experimentally proven.
mg: now i feel like learning something cuz most of my time i jus sit on the computer and chat its very little that i reply to ne of the topics