Knock Nevis, who's there?

Turns out the TI class of supertankers wasn't the largest ever built.  That distinction belongs to the leviathon Knock Nevis, above.  As a tanker the ship was known under the names Seawise Giant, Happy Giant, and Jahre Viking. 

The Knock is listed as 260,941 Gross Tonnes and has a length of 1504.1 feet,  making her the largest ship ever constructed.  She has a beam (width) of 225.72 feet and a draft of 80.74 feet, which is too deep to navigate the English Channel, the Suez Canal and the Panama Canal.  

(For the numerically-curious, my little Calypso is 6.045 tonnes, has a 28 foot over-all length, a beam of nine feet and a draft of 4.5 feet.)

But Knock Nevis isn't the biggest in every respect.  In terms of gross tonnes she ranks fifth, at 236,710 gross tonnes, behind the four Batillus class supertankers. These ships are apparently the largest self-propelled objects ever built.

In 2004 Knock Nevis was converted into a storage tanker and is now permanently moored at the Qatar Al Shaheen oil field in the Persian Gulf.