3. Pierre Guillaumat – Length: 414 metres (1,358 ft)
Pierre Guillaumat was a supertanker, named after the French politician and founder of Elf Aquitaine oil industry, Pierre Guillaumat. The vessel was completed and put in service in 1977. Because of her gigantic proportions the utility of Pierre Guillaumat was very limited. She couldn’t pass through either the Panama or Suez canals. Because of her draft, she could enter a minimal number of ports in the world, and was therefore moored on offshore rigs, and oil terminals like Antifer and after off-loading to reduce her draft, at Europoort.
2. Seawise Giant/Knock Nevis/Jahre Viking – Length: 458 metres (1,502 ft)
Seawise Giant, later Happy Giant, Jahre Viking, Knock Nevis, Oppama, and Mont, was a ULCC supertanker. She possessed the greatest deadweight tonnage ever recorded. Fully loaded, her displacement was 657,019 tonnes (646,642 long tons; 724,239 short tons), the heaviest ship of any kind, and with a laden draft of 24.6 m (81 ft), she was incapable of navigating the English Channel, the Suez Canal or the Panama Canal. She was sunk during the Iran–Iraq War, but was later salvaged and restored to service. 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.
1. Prelude FLNG – Length: 488 metres (1,601 ft)
The Prelude FLNG is the world’s largest floating liquefied natural gas platform as well as the largest offshore facility ever constructed. The Prelude was built by the Technip / Samsung Consortium (TSC) in South Korea for a joint venture between Royal Dutch Shell, KOGAS, and Inpex. It is 488 metres (1,601 ft) long, 74 metres (243 ft) wide, and made with more than 260,000 tonnes of steel. At full load, it will displace more than 600,000 tonnes, more than five times the displacement of a Nimitz-class aircraft carrier.