Due to Rising Seas, most of the land is lost, fleets of sentient warships mysteriously appear and devastate the world's navies. The Blue Steel submarine defects to the human side to help fight back.
All the anime I've watched good or bad (even if i haven't finished them)
I have different criteria for something that counts as an anime than most people that being a show:
-must have an anime style
-an interconnected story line (can be an anthology)
-doesn't necessarily need to be from japan or adapted from manga