Seawise Giant

No AIS position on record for this vessel. Identity and particulars are below.

Identity & particulars

Name

Seawise Giant

IMO numberWhat is an IMO number?

7381154

MMSIWhat is an MMSI?

—

Call signWhat is a call sign?

—

Flag

—

Vessel type

Oil tanker

Gross tonnageGross tonnage vs deadweight

260,941

Deadweight (DWT)

WikidataSource: Wikidata, record Q2554. Added to Voydar on September 23, 2026. Licence: CC0 1.0.564,763 t

Length overall

458.5 m

Beam

68.8 m

Year built

1979

A tag next to a value names the register that supplied it (hover or tap it for the record and date). Values without a tag come from the ship's own AIS broadcasts or from Wikidata. Position and identity are derived live from AIS.

About Seawise Giant

TT Seawise Giant—formerly Oppama; later Happy Giant, Jahre Viking, Knock Nevis, and Mont—was a ULCC supertanker and the longest self-propelled ship in history. It was built in 1974–1979 by Sumitomo Heavy Industries in Yokosuka, Kanagawa, Japan. Seawise Giant's engines were powered by Ljungström turbines. The ship possessed the greatest deadweight tonnage ever recorded. Fully laden, her displacement was 657,019 tonnes. At the time she was built, she was the heaviest self-propelled ship of any kind. With a laden draft of 24.6 m (81 ft) and a length of 458.45 m (1,504.1 ft), the ship was incapable of navigating the English Channel, the Suez Canal or the Panama Canal. She is generally considered the largest self-propelled ship ever built.

Summary from Wikipedia, licensed CC BY-SA.

Frequently asked questions

Where is Seawise Giant now?

Voydar has no displayable AIS position for Seawise Giant in this profile. A coverage gap does not establish whether the ship is transmitting or where it is now.

What kind of ship is Seawise Giant?

Seawise Giant is an oil tanker, built in 1979 by Sumitomo Heavy Industries. The vessel is 458.5 m long with a beam of 68.8 m and has a gross tonnage of 260,941.

What sanctions and inspection records does Voydar hold for Seawise Giant?

Voydar has no matched sanctions record displayed for Seawise Giant from the OFAC SDN list, the UK Sanctions List, the Canadian autonomous sanctions list, the EU list of designated vessels, the New Zealand Russia Sanctions Register and the French national asset-freeze register. Coverage may be incomplete; this is not sanctions clearance. No matched inspection records are displayed for Seawise Giant. Missing records do not establish whether the ship has been detained.