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.
Unfortunately the movie Undersea Fleet Submarine 707F is not yet available on HBO Max.
| Directing | Teruo Kogure | Director |
| Writing | Hideyuki Matsubara | Screenplay |
| Sound | Masakuni Kikuchi | Music |
| Crew | Satoru Ozawa | Creator |
| Visual Effects | Masatomo Sudo | Character Designer |
| Art | Shoji Tokiwa | Art Direction |
| Visual Effects | Teruo Kogure | Animation Director |
| Sound | Hideyuki Tanaka | Sound Director |
| Production | Noriko Nishino | Producer |
