OK, the Tourism Industry will not like this, but here's the basic facts on the Bermuda Triangle.
The main cause of disappearances was due to a local magnetic anomaly, coupled with nasty reefs around the islands (yes, they're a chain of islands) and sudden storms. The British Admiralty charted the magnetic anomaly at Bermuda in the late 1800's, and it's shown on current charts (maps for mariners). The magentic bearing of North swings from 7 degrees west of North at the western edge to 14 degrees east at the eastern end. Each degree translates to 69 statute miles on the earth's surface. Thus, if you're looking for a small pace to begin with, and your compass isn't working, it's easy to get lost. It's a big ocean out there.
As for the storms, well they're just heat engines. With very warm water year-round, there's a lot of energy to build up. Also, with 700 miles of free space around the islands, there's plenty of fetch for the wind and waves to build up. Storms are particularly nasty in the winter, because of the heat differential.
With the reefs, there's over 400 documented wrecks within a mile or two of the shore. In the 400 plus years of transatlantic travel in this area, there's probably many more yet to be discovered. Also, with the sea floor dropping to over 12000 ft a few miles out, there's many lost vessels and planes that will never be found.
Just thought a Bermudian engineer should set the record straight. The other stuff is fun to read, though.