During World War I, the USS Cyclops, commanded by Lt. G. W. Worley, carried coal for the U.S. Navy and stayed mostly on the East Coast of the United States until 1918 when it was sent to Brazil to refuel Allied ships. With 309 people onboard, the ship left Rio de Janeiro in February and reached Barbados in March. After that, the Cyclops was never heard from again. The Navy says in its official statement, "The disappearance of this ship has been one of the most baffling mysteries in the annals of the Navy, all attempts to locate her having proved unsuccessful. There were no enemy submarines in the western Atlantic at that time, and in December 1918 every effort was made to obtain from German sources information regarding the disappearance of the vessel." This tragedy stands as the single largest loss of life in U.S. Naval history not involving combat.