Blue Submarine No. 6 (青の6号, Ao no Roku-gō) is a Japanese post-apocalyptic 3-volume manga series written and illustrated by Satoru Ozawa. The manga was published in 1967 by Shogakukan, and was serialized in Weekly Shonen Sunday magazine. When the OVA adaptation was announced by Gonzo, the manga was remastered into 5 volumes under the new name AO6, and published by Seika Bukansha and was serialized in Sebun Comics magazine on June 1997. The OVA series was released in 2000 and received two video games for PlayStation and Dreamcast.
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.