The Great Lakes have a documented history of shipping losses that is more extensive than the Atlantic region commonly known as the Bermuda Triangle. Records compiled by the Great Lakes Shipwreck Museum estimate that roughly 6,000 vessels have sunk in the lakes, with some researchers suggesting the figure could reach 8,000. Historical accounts place the number of fatalities in these waters at approximately 30,000 since the 1600s, a figure substantially higher than the roughly 1,000 deaths commonly cited for the Bermuda Triangle.

Maritime experts attribute the high hazard level to the physical properties of fresh water and the behavior of storms on the lakes. Fresh water is less dense than salt water, which means ocean freighters entering the Great Lakes via the Saint Lawrence Seaway sit about six inches lower in the water than they do in the ocean. On a large freighter loaded with cargo, that reduction in buoyancy leaves less margin for error during rough conditions.

Wave patterns on the lakes also differ from the open ocean. Ocean swells travel long distances and arrive at relatively long intervals. On the Great Lakes, waves have a shorter distance to build, which produces steeper, more closely packed waves. These conditions can place a ship in a position where one wave lifts the bow while another lifts the stern, a situation sailors refer to as being caught in the trough. Rogue waves, including a phenomenon known as the three sisters, have been documented by researchers at the University of Wisconsin-Madison, who recorded waves twice the height of surrounding seas appearing in close succession.

The most severe storm on record struck in November 1913, when two weather systems collided over the lakes. The storm, sometimes called the White Hurricane, lasted four days and produced sustained winds above 60 mph, with some gusts exceeding 80 mph. Waves reached 35 feet. On Lake Huron, eight freighters sank in roughly six hours on the night of November 9. Official records from the United States Life Saving Service listed 248 deaths, though historians believe the actual figure was higher. Nineteen ships were destroyed and 31 were driven ashore or stranded. Some of the vessels that sank, including steel freighters over 400 feet long, were later found capsized. The Wexford, one of the ships lost in that storm, was not located until 2000, when divers found it upright in 80 feet of water.

Navigation on the lakes has its own unusual feature. The region around Lake Superior sits above large deposits of iron ore, and the magnetite in both the bedrock and the cargo carried by ore ships can interfere with compass readings. This phenomenon was first noticed in 1844 when a surveyor mapping the Upper Peninsula of Michigan observed his compass needle spinning. The discovery led to the development of the region’s iron mining industry. The effect on navigation has remained a practical issue for crews in the area.

Certain sections of the lakes have a higher concentration of incidents. The Lake Michigan Triangle, which spans the water between Manitowoc, Wisconsin, Ludington, Michigan, and Benton Harbor, has been the site of several notable disappearances. In 1937, the captain of a freighter disappeared from his locked cabin while the ship approached port. His body was never found.

In June 1950, Northwest Orient Airlines Flight 2501, a DC-4 carrying 55 passengers and three crew members, disappeared over Lake Michigan during a night flight from New York to Seattle. The pilot had requested permission to descend from 3,500 feet to 2,500 feet due to storms, but the request was denied. That was the last communication from the flight. Search crews recovered seat cushions, luggage, and other debris, but no intact wreckage or complete bodies were found. Remains that washed ashore were buried in unmarked graves near South Haven, Michigan. In 2008, researcher Valerie Van Heest of the Michigan Shipwreck Research Association located one of those graves and organized a ceremony to place a marker bearing the names of all 58 people on board. Despite extensive sonar searches over two decades that located other shipwrecks, the plane itself has never been found. Van Heest announced in 2025 that the search was ending.

Other vessels have disappeared under similar circumstances. In 1902, the Canadian freighter Bannockburn left Thunder Bay with a crew of 20 and a cargo of wheat. The captain of a nearby ship reported seeing the vessel through binoculars, and then it was gone. A winter storm passed through the area that night. Only an oar and a life preserver were ever recovered. The wreck has never been located, and sailors have reported sightings of the ship in the years since.

The eastern end of Lake Ontario, sometimes referred to as the Marysburg Vortex, has been associated with a high number of losses. Investigative reports have estimated that between 270 and 500 ships and at least 40 aircraft have gone down in that area alone.

While some writers have used the term “Great Lakes Triangle” to describe unexplained disappearances, maritime researchers point out that most of the vessels once listed as missing have actually been located. Of roughly 5,000 documented wrecks, about 225 remain missing, most of which sank in storms or collisions in deep water. The causes are considered natural rather than mysterious.

The conditions that produce these losses return every November, when cold Arctic air moves over warmer lake water, creating intense storms. Records show that nearly 30 percent of all documented Great Lakes shipwrecks occurred in November, a period sailors refer to as the Gales of November.

The cold fresh water of the lakes preserves what sinks. Ships that have been underwater for decades remain relatively intact, and the bodies of crew members are sometimes preserved as well. In one case, the remains of a crew member from the Edmund Fitzgerald, which sank in Lake Superior in November 1975 with all 29 crew members lost, were observed during a 1994 expedition. The wreck has been left undisturbed at the request of the families, who consider it a grave. The ship’s bell was recovered in 1995, and a replica with the names of the crew was placed in its position on the wreck.

The lakes remain an active shipping route, and their hazards are well documented by official records dating back to 1812. The comparison to the Bermuda Triangle is a matter of scale: the Great Lakes cover about 94,000 square miles, and the density of wrecks in some sections is higher than in the much larger Atlantic region that has drawn more public attention.