The Bermuda Triangle is a patch of the Atlantic Ocean, out at sea between Florida, Puerto Rico and the island of Bermuda. For many years people have told stories and written books about it. Numerous ships and planes travel through it, so it is a busy part of the ocean. As of September 2026, PortMiami, on the Florida edge of the region, welcomed its 10 millionth cruise passenger of fiscal year 2026 on September 14, a new record. That combination of heavy traffic and a long shelf of stories makes the Triangle a useful test case for a general question: when something is reported again and again, how does anyone find out what the evidence actually shows? The answer begins with the plainest facts, the name, the map and the traffic.
The name 'Bermuda Triangle' comes from a 1964 magazine article by a writer named Vincent Gaddis. Gaddis drew the Triangle by joining three points: Florida to Bermuda, Bermuda to Puerto Rico and Puerto Rico back to Florida; most modern maps follow his description. Bermuda is a British overseas territory in the North Atlantic, and its nearest land is Cape Hatteras, North Carolina, approximately 640 miles (1,030 km) away. The edges of the shape are loosely defined, though, and writers draw it a little differently. No official maps mark its boundaries, and the U.S. Board on Geographic Names does not recognize the name or keep an official file on the area. The area people call the Bermuda Triangle covers approximately 500,000 square miles (1.3 million square kilometers) of ocean.
A legend usually has a trail, and this one can be followed in print. It runs from a 1950 Associated Press story about five missing Navy planes, to a 1952 Fate magazine article called 'Sea Mystery at Our Back Door', to the name 'Bermuda Triangle' in Argosy magazine in February 1964. In 1974 Charles Berlitz published a book that became a best seller and made the Bermuda Triangle famous. His book claimed the lost city of Atlantis was somehow behind the disappearances, and dozens more books followed. A 1974 documentary, 'The Devil's Triangle', and Steven Spielberg's 1977 film 'Close Encounters of the Third Kind' helped spread the story.
The Triangle was not the only place to attract such writing. A skeptical writer states that in April 1971 the writer Ivan Sanderson wrote about twelve spots around the globe, which he called 'vile vortices', that he believed could be portals to another dimension. Science Focus states the Bermuda Triangle legend lasted because people are drawn to mystery, so early reports of disappearances attracted wide attention. Once the legend was established, reporters were quick to blame more wrecks on the Triangle. The frenzy has since eased, perhaps because modern technology tracks ocean and air traffic more precisely than it once did.
In the 1970s a librarian named Larry Kusche checked the original records behind the Bermuda Triangle stories instead of just retelling them. He used Coast Guard records, weather records, maritime records at Lloyd's of London and newspaper stories from the time instead of hearsay. His book 'The Bermuda Triangle Mystery—Solved' (Harper & Row, 1975) discovered that many accounts of vanishings were based on inaccurate information or careless research. He concluded that a typical writer retold stories from earlier books and added details, so the stories grew like a secret whispered around a circle of friends. Kusche discovered that ships said to be lost in calm weather had actually met storms, that some of the incidents happened far outside the Bermuda Triangle, and that some did not happen at all. For some 'missing' vessels, the wreckage was later discovered miles away, a fact the stories left out.
Flight 19 is one case from the stories. In December 1945 a flight of five Navy training planes, known as Flight 19, lost track of where it was over the Atlantic off Florida; its leader reported that the compasses seemed to be malfunctioning. The Navy's record said the Flight 19 planes were lost for 'causes or reasons unknown'. Kusche concluded that the Flight 19 training flight was lost mainly because the pilots lacked experience; he spent seven years researching it, including interviews and retracing the route.
To see how a flight could lose track of its position, it helps to know how navigation worked in the 1940s. The first weather satellite was launched in 1960, so in the 1940s nobody could watch storms from space. Ships and planes found their way with compasses, charts and radio direction finders, among other tools. Navigators relied on dead reckoning (working out position from direction and speed), celestial navigation, and then direction finders and radio range stations; over oceans, dead-reckoning errors were large. Over the ocean, navigators could aim deliberately to one side of a destination, so that when the island did not appear they knew which way to turn. Wireless radio navigation grew during World War II: Loran, a hyperbolic system that used synchronized radio pulses from widely separated stations, worked in all weather except very severe electrical disturbances.
Compasses sit at the center of many of the stories, so it is worth stating exactly what they do. A compass needle follows Earth's magnetism, which helps people tell which way is north. It points along the horizontal part of the magnetic field where it is, not toward any single point such as the magnetic pole. Magnetic declination, additionally called magnetic variation, is the angle between magnetic north, where a compass points, and true north, the direction of the North Pole. It is different from one place to another and slowly changes over time, because magnetic north keeps shifting. To get a true bearing from a compass bearing, a navigator adds the magnetic declination for that place, so forgetting it would send a ship or plane off course.
Some of the oldest compass stories come from the same waters. Christopher Columbus wrote in 1492 that his compass readings were odd while he sailed through this part of the Atlantic. Some writers say true north and magnetic north lined up in part of the Bermuda Triangle long ago, which could have thrown off sailors' and pilots' navigation. NOAA states there is some evidence that in the Bermuda Triangle a magnetic compass sometimes points toward true north instead of magnetic north.
Weather and water form a second line of evidence. According to NOAA, most Atlantic tropical storms and hurricanes pass through the Bermuda Triangle area. The Gulf Stream flows at approximately 4 miles per hour on average, up to approximately 5.6 mph near the surface, and carries more water than all of the world's rivers combined; it is sometimes 15 to 20 degrees Fahrenheit warmer than the water next to it, and it has existed for only approximately 2.5 million years. NOAA states the Gulf Stream can cause rapid, sometimes violent changes in weather. Brief, violent thunderstorms called meso-meteorological storms can spring up at sea without warning, disrupting ship communications and stirring up enormous waves, states Howard Rosenberg, a reporter and Navy veteran who wrote for the Naval History and Heritage Command.
Large waves are a third line. Rogue waves are unusually large waves that appear among smaller ones: more than twice the height of the surrounding waves, frequently from an unexpected direction. Scientists frequently call a wave a rogue if it is 2.2 times as tall as the significant wave height, which is the average height of the tallest third of the waves in that patch of ocean. Scientists once thought a rogue wave would hit any given spot in the ocean only approximately once every 10,000 years, but data from buoys and platforms suggest such big waves are considerably more frequent. A study reported by Science Focus suggested that converging storms might generate rogue waves up to 30 meters (almost 100 feet) high that could sink even large boats. Science Focus additionally reports that there is no evidence such waves actually occur in the Bermuda Triangle.
A fourth proposal involves gas under the sea floor. Gas hydrate is an ice-like solid made of water and gas, such as methane, that can form in the sediments under the sea floor. Gas hydrate exists along the U.S. North Atlantic continental margin, with a very large field on Blake Ridge, north of the Bermuda Triangle. USGS states gas hydrate is not stable at normal sea-level pressures and temperatures, and that it can affect the stability of sea floor sediment, leading to collapse and landslides. A 2003 American Journal of Physics study discovered that a large bubble released under a model ship could make it lose buoyancy and sink, at least in principle. There are two scientific caveats about a methane explanation: the model experiment worked, but there is no evidence it ever actually happened. Studies by the U.S. Geological Survey record no significant methane releases in the Bermuda Triangle area in the past 15,000 years, and gas hydrates do not break down explosively unless extreme pressure builds up, states Ruppel, who leads the USGS Gas Hydrates Project.
The numbers give a way to compare. A 2013 WWF study of the most accident-prone waters for shipping did not list the Bermuda Triangle; it named the South China Sea and East Indies, the east Mediterranean and Black Sea, and the North Sea and British Isles as the hotspots for shipping accidents. Since 1999 there have been 293 shipping accidents in the South China Sea and East Indies, according to WWF's 2013 study. As Allianz reported in 2013, the number of ships lost worldwide averages approximately 146 a year, and 106 ships were lost in 2012. The same 2013 report discovered that shipping accidents were down 27 percent over ten years, and that human error remains the core challenge. WWF reported in 2013 that general cargo vessels account for 40 percent of ships lost at sea, and that foundering, where a boat sinks because of rough weather, leaks or breaking in two, causes about half of all shipping accidents.
Official bodies and insurers have looked at their own records. The U.S. Navy and U.S. Coast Guard say there are no supernatural explanations for disasters at sea, and that nature and human mistakes together explain them. According to EBSCO's research summary, Lloyd's of London and the U.S. Coast Guard both say this part of the Atlantic is not unusually dangerous, and that the number of accidents is in proportion to how busy the shipping route is. The Coast Guard has said that a review of many aircraft and vessel losses in the area discovered nothing that indicated anything other than physical causes, and that no extraordinary factors have ever been identified.
Skeptical writers add a point about method. One states that to investigate the Bermuda Triangle scientifically one starts with an observation and then tests explanations, and that popular programs frequently skip the first step: showing losses are higher there. A skeptical writer notes that losses happen in the Triangle just as they do everywhere else on Earth, and that a similar share of losses worldwide are additionally unexplained. Unexplained does not mean unexplainable: it means that not enough evidence remained to learn what happened, which is common with losses at sea. One skeptic compared looking for one cause of every Bermuda Triangle disappearance to looking for one cause of every car accident in Arizona.
The sea itself makes evidence hard to gather. Earth's seas cover approximately 70 percent of the planet and average approximately 12,100 feet (3,700 meters) deep, so a lost boat or plane can leave little to find. The swiftly flowing Gulf Stream would quickly spread out any wreckage from an accident, making evidence hard to find. Scientists do not have many detailed shipboard measurements of rogue waves, because they tend to appear without warning and bobbing ships make poor observation platforms. The Triangle area is one of the most heavily traveled regions in the world, and with more ships and planes, the odds that something goes wrong for some of them are greater. The first question, how anyone finds out what the evidence shows, can be answered here: by comparing. NOAA, the U.S. ocean science agency, states there is no evidence that unexplained trouble happens more frequently in the Bermuda Triangle than in other busy parts of the ocean.
Words to know
- declination: north-angle gap
- skeptical: carefully doubting
- foundering: sinking
- hydrate: ice-like solid
- caveats: warnings
- buoyancy: ability to float
