Before I saw Blue Submarine No. 6. I remember watching a very similar anime. The basic similarity was in that both shows feature prominently an indefeatable battleship, and an equally indefatigable crew. However, Shin Kaitei Gunkan is different in that it is significantly older, and other historical themes play a more important role. For example, the titular submarine, is a symbol of Japanese nationalism during World War II, in the same way, that the antagonist's battleship, the Liberty, is an expression of perceived American imperialism. In any case, despite these strong echoes from the past, it is a highly enjoyableexperience, although one that is short-lived, and inconclusive, leading one to wonder whether the conflict with the Mu was resolved at all.