The Knock Nevis, formerly called Seawise Giant, Happy Giant and Jahre Viking, was a ULCC supertanker, which was built between 1979 and 1981 in the shipyards of Oppama (Japan). 458 meters long and 69 meters wide, it was the world's largest ship, and that, in turn, had the highest gross tonnage to date.
It could not cross the English Channel, the Suez Canal or the Panama Canal. In general, it was considered as the largest ship ever built and the largest moving object made by man. His last assignment was as a floating storage and download Offshore (FSO), anchored off the coast of Qatar (Persian Gulf) in the Al Shaheen oilfield.
The ship was sold to an Indian company shipbreaking, and renamed Mont for final trip in December 2009. After getting the permission of the customs authorities, was stranded intentionally in Alang, Gujarat, India, for dismantling.
Since 1986 it was used as a floating warehouse and transport by Iran during its war against Iraq. In May 1988, the ship was attacked and severely damaged by Iraqi airplanes in the Strait of Hormuz. In late 1989, the end of the war, the ship was bought from the Norwegian company KS-Company, controlled by Norman International. The ship was repaired at the Keppel shipyard in Singapore and renamed like Happy Giant, although in 1991, before the repairs were finished, the company passed into the hands of Jorgen Jahre and the ship was launched under the name of Jahre Viking. In late 1990, KS-Company was purchased by the First Olsen Tankers.
In March 2004, the ship was sent to the shipyard Dubai Drydocks to be renovated as a floating warehouse, was again renamed, this time as Knock Nevis.