Ao no 6-gou
English title: Blue Submarine No. 6
Japanese title: 青の6号
Alternative titles: Ao no 6-go, Ao no Rokugou, Ao no Rokugo
Type: OVA
Source: Manga
Episodes: 4
Status: Finished Airing
Aired: Oct 25, 1998 to Mar 25, 2000
Duration: 31 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Gonzo
Licensors: Bandai Entertainment, Discotek Media
Genres: Action, Adventure, Award Winning, Sci-Fi
Themes: Mecha, Military
Demographics: Shounen

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)

Ao no 6-gou won the Packaged Work Award at the 1999 Animation Kobe Awards.