In March 1918, the U.S. Navy’s largest fuel ship left Barbados carrying 11,000 tons of manganese ore and 306 people, but it vanished without sending a single distress call: More than a century later, no confirmed trace of the ship has ever been found

On March 4, 1918, the USS Cyclops, then the largest fuel ship in the U.S. Navy, departed Barbados on what should have been the final leg of its voyage to Baltimore. Loaded with approximately 11,000 tons of manganese ore and carrying 306 officers, sailors, and passengers, the massive vessel had less than 2,000 nautical miles left to travel. It never arrived. No distress signal was transmitted, no wreckage was recovered, and no confirmed trace of the ship has ever been found. More than a century later, the disappearance of the USS Cyclops remains the single greatest non-combat loss of life in U.S. Naval history and one of the service’s most enduring mysteries.

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