The Seawise Giant, also known as Happy Giant, Knock Nevis, and Mont, holds the title of the world's largest ship, surpassing iconic structures like the Eiffel Tower and the Empire State Building in length. Built in Japan between 1974 and 1979, it features the highest deadweight tonnage ever recorded at 657,019 tonnes. The ship's substantial dimensions included a length of 458.45 meters (1,504.1 feet) and a draft of 24.6 meters (81 feet), rendering it incapable of navigating through significant maritime passageways such as the English Channel, Suez Canal, and Panama Canal.

Constructed by the renowned Sumitomo Heavy Industries, Ltd., the Seawise Giant was designed as an Ultra Large Crude Carrier. It remained unnamed for an extended period and was primarily recognized by its hull number before gaining its various names over the years. This vessel's massive size is a striking testament to advancements in shipbuilding technology and the trend towards larger maritime transport solutions in the oil and gas industry.

The legacy of the Seawise Giant reflects the evolution of maritime transport, where the need for larger vessels emerged in response to global demands for efficiency in shipping. Its inability to pass through certain canals underlines the challenges that come with constructing and operating such monumental ships, posing questions about maritime infrastructure and the future limits of ship design.