http://www.calendarlive.com/tv/cl-et-tv ... 7102.story
Treasure Quest: Odyssey finds the location of U103, the World War I U-boat sunk by a passenger ship used as a troop carrier (10 p.m. Discovery). Thursday 12 March 2009.
U-103 - Sunk by White Star Liner Olympic (WWI)
May 12,1918, while on its twenty-second voyage as a troop carrier, Olympic, was attacked by U-103 in the English Channel. Two torpedoes were fired at the ship's port-side bow. Unarmed but much quicker, the Olympic was able to escape the torpedoes. The liner steamed out of harm's way, turned around, rammed U103 and quickly sank her. Several of U-103's crew were able to escape and were later picked up by an American destroyer. Olympic was the only merchant ship that sink an enemy vessel during World War I.