How big is the biggest oil tanker?

The biggest oil tanker ever built is the Knock Nevis, a ULCC (Ultra Large Crude Carrier) that measures approximately 1,504 feet (458.45 meters) in length and has a deadweight tonnage of around 564,763 tons. Launched in 1979, it was primarily used for transporting crude oil. While the Knock Nevis is no longer in service, its size remains unparalleled in the world of maritime shipping.