The Yamato class battleships, were battleships of the Imperial Japanese Navy (IJN) constructed and operated during World War II. Displacing 72,000 long tons (73,000 t) at full-load, the vessels of the class were the largest, heaviest, and most heavily-armed battleships ever constructed. The class carried the largest naval artillery ever fitted to a warship, nine 460-millimetre (18.1 in) naval guns, each capable of firing 2,998-pound (1,360 kg) shells over 26 miles (42 km). Two battleships of the class (Yamato and Musashi) were completed, while a third—Shinano—was converted to an aircraft carrier during construction.