| Submarine 707 | |
| Ja Kanji: | サブマリン707 |
| Ja Romaji: | Sabumarin 707 |
| Type: | manga |
| Author: | Satoru Ozawa |
| Publisher: | Shogakukan |
| Demographic: | Shōnen |
| Magazine: | Weekly Shōnen Sunday |
| First: | 1963 |
| Last: | 1965 |
| Volumes: | 6 |
| Type: | ova |
| Submarine 707: Deep Sea Fleet | |
| Director: | Teruo Kogure |
| Producer: | Noriko Nishino |
| Music: | Masakuni Kikuchi |
| Studio: | Knack Productions |
| Released: | 10 January 1997 |
| Runtime: | 45 minutes |
| Type: | ova |
| Submarine 707R | |
| Director: | Shōichi Masuo |
| Music: | Yutaka Minobe Hideaki Kobayashi |
| Studio: | Group TAC |
| Released: | 26 September 2003 |
| Runtime: | 45 minutes (each) |
| Episodes: | 2 |
is a Japanese manga series written and illustrated by Satoru Ozawa and serialized in Weekly Shōnen Sunday between 1963 and 1965. The manga series was adapted into two original video animations (OVA). The first OVA, titled, was produced by Knack Productions and released on 10 January 1997. The second OVA, titled, consisted of two episodes produced by Group TAC and was released between 26 September 2003 and 28 April 2004.
In the near future, the world is at war: the USR (the Undersea Silence Revolution or Underwater Silence Revolution), a mysterious organization led by Admiral Red and his powerful submarine UX, wants to stop human exploitation of the seas, using cutting-edge technology to torpedo and sink many ships and ports. The world's navies unite and form the Peace-Keeping Navy (PKN) to fight against the "terrorists". Every major UN member contributes a submarine, although the Japanese entry is an old clunker, the diesel sub 707 commanded by Captain Youhei Hayami. When the inaugural meeting finally begins, Admiral Red and the UX come to disrupt the meeting with a spread of torpedoes; due to a lack of command procedure and an unwise tight grouping of the PKN vessels, they are unable to fight back without damaging their own craft. Arriving late in the battle, Captain Hayami deliberately steers the 707 into the way of a torpedo launched at the supercarrier that serves as the PKN's flagship. His ship is destroyed, but the flagship, Captain Hayami and the 707 's crew survive.
Six months later, Captain Hayami is given command of a completely new 707, and takes on a crew of old comrades and brand new cadets to battle Admiral Red once more. As the inevitable showdown draws ever closer, it becomes a personal battle between Admiral Red with his superior technology and USR's submarine fleet and Captain Hayami with his incredible submariner skills and loyal crew.
The first original attempt for an anime series based on the manga was planned back in 1964 but around the same time released as an audio drama on .
In 1997, an OVA was released that titled byToei Doga. The "Submarine 707R" OVAs were released by Aniplex back in Sept. 26, 2003 (mission 01) and April 24, 2004 (mission 02).