Seawise Giant, later Happy Giant, Jahre Viking, Knock Nevis, Oppama, and finallyMont, was a ULCC supertanker and the longest ship ever built. She possessed the greatest deadweight tonnage ever recorded. Fully laden, her displacement was 657,019 tonnes (646,642 long tons; 724,239 short tons), the heaviest ship of any kind, and with a draft of 24.6 m (81 ft), she was incapable of navigating the English Channel, the Suez Canal or the Panama Canal. Overall, she was generally considered the largest ship ever built.^[5][6] She was sunk during the Iran–Iraq War, but was latersalvaged and restored to service.^[7] She was last used as a floating storage and offloading unit (FSO) moored off the coast of Qatar in the Persian Gulf at the Al Shaheen Oil Field.