The Japanese anime Blue Submarine No. 6 is online to watch full episodes with English subtitles. Blue Submarine No. 6 started out as a manga series by Satoru Ozawa,and was later developed into a four episode OVA series.

Blue Submarine No. 6 takes place in the future when most of the cities have been flooded. Thanks to the efforts of a scientist named Zorndyke the flooding killed billions. The last remaining cities have been destroyed and attacked by Zorndyke’s army of Hybrids. The best hope for the survival of humanity lies with the submarine attack force. So beings the story of the Blue Submarine #6.

Watch Blue Submarine No. 6 Online
Catch the series full ova episodes via this link