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Knock Nevis was built in 1979 at Sumitom Heavy Industries's Oppama shipyard as Seawise Giant for a Greek owner who proved unable to take delivery .

Size comparison of some of the longest ships. From top to bottom: Knock Nevis, Emma Maersk, RMS Queen Mary 2, MS Berge Stahl, and USS Enterprise (CVN-65).

The shipyard exercised its right to sell the vessel and a deal was brokered with Hong Kong Orient Overseas Container Line founder C. Y. Tung, to lengthen the ship by several meters and add 87,000 metric tons of cargo capacity through jumboisation.

Two years later she was relaunched as Seawise Giant.

After the refit, the ship had a capacity of 564,763 metric tons deadweight (DWT), a length overall of 458.45 meters (1,504.1 ft) and a draft of 24.611 meters (80.74 ft).

She had 46 tanks, 31,541 square meters (339,500 sq ft) of deck space, and drew too much water to pass through the English Channel.

From 1979 to 2004, she was owned by Loki Stream AS[2] and flew the Norwegian flag.

Damaged during the Iran–Iraq War while transiting the Strait of Hormuz, she was declared a total loss and laid up in Brunei.

At the end of the war she was towed to the Keppel Company shipyard in Singapore, repaired, and relaunched in October 1991 as the Happy Giant.

Jorden Jahre bought the tanker in 1991 for US$39 Million and renamed her Jahre Viking.

In 2004, she was bought by First Olsen Tankers Pte. Ltd.,[2][2] renamed Knock Nevis, and converted into a permanently moored storage tanker moored in the Qatar Al Shaheen oil field in the Persian Gulf.

Knock Nevis has just been renamed Mont, and reflagged with Sierra Leone, for a single voyage to India which will see the world's largest ever ship be scrapped.