08/09/2025
Seawise Giant – The Largest Ship Ever Built
The Seawise Giant holds a legendary place in maritime history as the largest ship ever built, an oil tanker stretching an astonishing 1,504 feet (458.46 meters) in length. From its launch in 1979 to its retirement in 2009, it witnessed decades of service, war damage, multiple name changes, and eventual scrapping—yet its legacy continues to captivate ship enthusiasts around the world.
Construction and Early Service
The vessel was constructed in the late 1970s by Sumitomo Heavy Industries in Japan. Initially commissioned by a Greek businessman, the order was later acquired by Orient Overseas Container Line (OOCL), owned by Hong Kong shipping magnate C.Y. Tung. Designed to carry enormous quantities of crude oil, the Seawise Giant primarily operated between the Middle East and the United States.
War Damage and Remarkable Salvage
In 1988, during the Iran-Iraq War, the Seawise Giant was transporting Iranian crude oil when it became a target of the Iraqi Air Force. The attack left it heavily damaged and sunk in the shallow waters near Iran’s Kharg Island.
However, its story didn’t end there—Norwegian salvage company Norman International raised the massive tanker, repaired it, and returned it to service under a new name: Happy Giant.
Changes in Ownership and Roles
Not long after, Norwegian shipping magnate Jørgen Jahre purchased the vessel and renamed it Jahre Viking. For years, it continued hauling crude oil across the globe. In 2004, it changed hands again, becoming the Knock Nevis under First Olsen Tankers. By then, its sheer size made it impractical for many ports, so it was anchored off Qatar and used as a floating storage and offloading unit (FSO).
Final Years and Scrapping
After three decades of service, the Knock Nevis was sold for dismantling. In 2010, it was beached at Alang, India, one of the world’s largest ship-breaking yards, and scrapped.
Legacy of a Maritime Giant
The Seawise Giant remains unmatched in length, outstripping even the largest modern supertankers. While its hull is gone, its 36-ton anchor lives on—displayed proudly at the Hong Kong Maritime Museum as a reminder of the golden age of supertankers and the engineering marvels of the 20th century.