The Imperial Japanese Navy fielded two "super battleships" during WWII. One was the Yamato and the other was Musashi. Musashi was sunk during the invaasion of the Philippines. The Yamato was sunk during the landings on Okinawa.
Paul Allen, owner of the Seattle Seahawks AND, more importantly, owner of the Flying Heritage Collection, has funded an attempt to find the IJN Musashi...and apparently he was successful. See the article here!