Ewood27 wrote:Some people postulate that the strange losses of ships and aircraft in the Bermuda Triangle are the result of large bubbles of gas rising from the seabed when the rock cannot contain them any longer. The bubbles are thought to be big enough to enclose a boat, which falls into the hole in the water. The water then closes back in and sinks the boat. Aircraft suffer engine failure and loss of lift when the gas bubble rises through the air. Maybe that's the line your bubbly man was pursuing.
Almost right but not quite.
The bubbles don't need to be big enough to enclose a vessel.
All they need to do is be small and plentiful enough to reduce the density of the water enough so that the ship basically falls through the highly aerated (methaneated) water to it's doom when the sea closes over the top of it.
You can try it in the bath if you like.
Take the shower head and pipe off the top of the taps (if you have that setup) and fill the bath up.
Get yourself a wee wooden boat, put the shower head about a foot under the boat pointing upwards and then blow hard down the tube.
You'll get loads and loads of wee bubbles of air out of the shower head under the boat and the boat will become extremely unstable and sink by halves or sink completely.
You could replace the air with methane but I wouldn't like to suggest a source or be responsible for the consequences if you do.