How wide is the biggest submarine?

The biggest submarine in the world is the Typhoon class submarine. It has a width of 574 feet and 2 inches. Only 6 have been completed. 3 have been scrapped, 2 preserved, and 1 is in current use by the Russian Navy.

Ans 2 - The 26,000 ton Typhoon has a beam (width) of 80.7 feet, and a length of 562.7 feet.

( - ref "Undersea Warriors" Capt. E L Schwab, USN .ret. )