The S.S. Marine Sulpher Queen

The S.S. Marine Sulphur Queen was a tanker was bound for Norfolk, Virginia from Beaumont, Texas carrying 15,000 tons of molten sulphur in heated tanks. Its last communication took place on Feb. 3, 1963, when its captain radioed a routine position report. The message placed her near Key West in the Florida Straits. She never reached Virginia.

Three days after the position report, Coast Guard searchers found a single life jacket floating 40 miles southwest of the tanker's last known position. It's likely that leaking sulphur may have caused an explosion. Escaping sulphur gas could have poisoned the crew and prevented them from sending a distress call. Officers on a Honduran banana boat reported to the Coast Guard that their freighter ran into a strong, acrid odor 15 miles off Cape San Antonia, the western tip of Cuba, just before dawn on February 3.
The area was known for being infested with sharks and barracuda, so it wasn't surprising that no bodies were ever found. The U.S. Coast Guard History Archive lists the following items eventually found from the Sulphur Queen: two pieces of board bearing the name of the ship, eight life jackets (some with rips believed caused by sharks teeth), five life rings, one shirt, one piece of oar, one oil can, one gasoline can, one cone buoy and one fog horn.

U.S. Navy Avengers Flight 19, 1945
The most famous Bermuda Triangle story is the mystery surrounding five missing Navy Avengers in 1945. The story of Flight 19 is usually summarized this way: a routine patrol set out on a sunny day with five highly experienced student pilots. Suddenly, the tower began receiving transmissions from the flight leader that they were lost, compasses were not working, and "everything looked wrong." They were never seen again, and extensive Navy investigations turned up no clues to explain the disappearance.
Lieutenant Charles C. Taylor led the mission, which included several planned course changes. They departed at 1:15 p.m. on December 5, 1945. At 3:00 p.m., Lieutenant Robert F. Cox was flying over Fort Lauderdale, Florida when he heard a signal that he thought was from a boat or plane in distress. He called Operations at the Naval Air Station to report what he had heard. Cox told Taylor to fly with the sun at his left wing and up the coast until he hit Miami. Taylor then said that they were over a small island with no other land in sight. If he was over the Keys as he had said, however, he should have seen several islands as well as the Florida peninsula.
With less than two hours' flying time until they ran out of fuel, Taylor described a large island to Operations. Assuming this was Andros Island, the largest in the Bahamas, Operations sent Taylor a heading that would take him to Fort Lauderdale. Apparently this heading was correct, because once Flight 19 assumed the new course, Taylor's voice began coming in stronger over the radio. Taylor, however, didn't believe this course was right and after a few minutes said that they "didn't go far enough east. Turn around again and go east. We should have a better chance of being picked up closer to shore." With this move, transmissions began to weaken as they flew out of radio range in the wrong direction. For unknown reasons, Taylor ignored the standard flying procedure of flying west if over water and east if over land.

Two PBM-5 Mariner seaplanes went out to search the area, but one exploded soon after takeoff. The other never located Flight 19.