The Yamato and its sister ship Musashi were the largest battleships ever built, commissioned by the Imperial Japanese Navy in 1941 and armed with nine 46 cm main guns, the biggest naval artillery ever mounted on a warship. This film traces the vessel from its secretive design and construction through its role as a floating symbol of Japanese naval power, using archival footage and expert commentary to lay out the engineering behind its armor and firepower. It follows the ship into the Battle of Leyte Gulf in 1944, where its guns saw combat against a fleet already being decided by aircraft carriers rather than battleships. The final chapter covers April 1945, when American carrier planes caught Yamato on a one-way mission toward Okinawa and sank it with a sustained barrage of bombs and torpedoes. The film treats the ship's end as the clearest evidence of how naval warfare had already changed, leaving the most heavily armored battleship ever built defenseless against airpower.