The Yamato Japanese Battleship is the largest ever built weighing over 70,000 tonnes and equipped with nine gigantic 18" main guns. It entered service a week after the hit on Pearl Harbor in 1941 though didn't really saw combat as she spent most of WWII in between Japanese ports. When she did enter in 1945 to secure Okinawa she was intercepted by US submarines and bomber aircrafts, was hit several times and sunk with many casualties in the process.