Bermuda Triangle incidents could be caused by gas hydrates
Gas hydrates are pockets of methane gas that bubble up from the continental shelf with the result that sea water loses its buoyancy causing ships to sink suddenly. Following is a 1996 diagram from the U.S. Government posted on Wikipedia showing the location of known pockets of gas hydrates, including the Bermuda Triangle off the coast of Florida:
Could the demise of Atlantis be associated with gas hydrates?