Shinkai no Kantai: Submarine 707 is a oVA anime that premiered in winter 1997, produced by Knack Productions.

About the production: the story comes from a manga, there is 1 episode of about 50 minutes and its current status is "finished".

Its main genres are adventure and sci-fi.

On AniList, Shinkai no Kantai: Submarine 707 has an average score of 52%, an average score, and appears on 572 users' lists.

The franchise continues in or follows from: Submarine 707R.

A mysterious object attacks and destroys any ship or submarine. Submarine 707 has the mission to search for that mysterious object, when summoned by a whale to follow it. The whale leads them to the world of Mu. But on their way they meet the mysterious object. They find out , it is Commander Red Silver, who had attacked the world of Mu to get Mu's magma sources. Submarine takes up the battle to defeat Red Silver and save Mu, and the world for that matter. (Source: Anime News Network)

Official synopsis from AniList.