3619758 U.S.S. Cyclops, 1915-17 (b/w photo) by Harris & Ewing (1905-45); Private Collection; (add.info.: USS Cyclops (AC-4) was one of four Proteus-class colliers built for the United States Navy before World War I. The loss of the ship and 306 crew and passengers without a trace within the area known as the Bermuda Triangle some time after 4 March 1918 remains the single largest loss of life in U.S. Naval history not directly involving combat. ); American, out of copyright.