Animie, was about subamrine to alien warfare, what was the name plz?

Question

All I remember was seeing a few eppisodes of this show I thought it was titled BlueSea I think....but it's about how this guiy is like bilily badasz and the military now only some assortments of subs due to the Earth being covered in water(I think)
yeah well, cool show, I'd like the name of the show plz, thanks.

Answer 1

Is it Blue Submarine Number 6?
http://myanimelist.net/anime.php?id=1051

But I would probably say it is Tide-Line Blue.
http://myanimelist.net/anime.php?id=473