Ao no 6-gou
English title: Blue Submarine No. 6
Japanese title: 青の6号
Type: OVA
Episodes: 4
Source: Manga
Genres: Action, Adventure, Award Winning, Sci-Fi
Studios: Gonzo
Duration: 31 min per ep
Rating: PG-13 - Teens 13 or older

The once famous and well respected scientist Zorndyke has bred a new genre of living being, one that thrives on the oceans and lives to destroy humans. Zorndyke believes it is time that the humans were relieved of their rule of the earth. It is up to Blue Submarine No. 6 and the rest of the Blue fleet to put an end to Zorndyke's madness and creations.

(Source: ANN)