The Knock Nevis is a Norwegian owned supertanker, formerly known as Seawise Giant, Happy Giant, and Jahre Viking. She is 458 metres (1504 feet) in length and 69 m (226 ft) in width, making her the largest ship in the world. She was built between 1979 and 1981, damaged during the Iran-Iraq War, and refloated in 1991, but is now used as an immobile offshore platform for the oil industry.
Knock Nevis has a deadweight of 564,763 tonnes and a summer displacement of 647,955 t when laden with nearly 650,000 m³ (4.1 million barrels) of petroleum. The ship has a draft of 24.6 m (81 feet) when fully loaded, which makes it impossible for the ship to navigate even the English Channel, let alone man-made canals at Suez and Panama. (from Wikipedia)