The flammable ice hypothesis
The Bermuda Triangle Methane Theory centers on a naturally occurring substance called methane hydrate, a solid, ice-like material where methane gas molecules are trapped within a crystal lattice of water. These formations, also known as clathrates, are stable only under conditions of high pressure and low temperature, commonly found in deep ocean sediments. One of the world's largest deposits is on the Blake Ridge, an area off the southeastern coast of the United States, partially within the Bermuda Triangle. Estimates suggest the Blake Ridge alone may hold gas hydrates containing 57 trillion cubic meters of methane.
The theory posits that a sudden change in pressure or temperature, perhaps due to seismic activity or shifting ocean currents, could destabilize these solid hydrates. This destabilization would trigger a rapid and violent release of huge volumes of methane gas from the seafloor. A single cubic meter of solid methane hydrate can release approximately 164 cubic meters of methane gas upon decomposition. Such a massive, explosive release is sometimes referred to as a "mud volcano" or "oceanic flatulence."
The physics of a gas-fueled sinking
A catastrophic release of methane gas would create a large plume of bubbles rising to the surface. This process could dramatically reduce the density of the seawater. A ship's buoyancy depends on displacing a weight of water equal to its own mass. If a vessel sails into a region of this frothy, aerated water, it could lose buoyancy almost instantly and sink rapidly, potentially without time to send a distress signal. Laboratory experiments with model ships have demonstrated that under specific conditions, a large bubble or a dense field of smaller bubbles can cause a vessel to sink.
The theory is sometimes extended to aircraft. A large cloud of methane gas rising into the atmosphere could create a highly combustible fuel-air mixture that could be ignited by an aircraft engine, causing an explosion. The methane could also displace oxygen, causing engines to stall or creating a hypoxic environment for the flight crew.
While scientifically plausible, the theory has significant challenges. The United States Geological Survey (USGS) notes that no large-scale, rapid releases of gas hydrates are believed to have occurred in the Bermuda Triangle region for the past 15,000 years. Most methane releases from the seafloor are slow seeps, not violent eruptions capable of affecting surface vessels. While the physics are sound in principle, there is no direct evidence linking such an event to any specific disappearance.