Water Line Series
Apparently unsatisfied with the 18-inch (46cm) guns of the Yamato and Musashi, the largest ever installed on a warship, the IJN wanted to up the ante even further by installing monstrous 20-inch (51cm) guns in three two-gun turrets, rather than the original three-gun turrets, on two "Super Yamato"-class battleships, but those plans were abandoned in 1942.
