* Astronomy

USS Cyclops (AC-4) was one of four Proteus-class colliers built for the United States Navy several years before World War I. Named for the Cyclops, a primordial race of giants from Greek mythology, she was the second U.S. Naval vessel to bear the name. The loss of the ship and 306 crew and passengers without a trace sometime after 4 March 1918 remains the single largest loss of life in U.S. Naval history not directly involving combat. The cause of the ship's loss is unknown.
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