The Silent Service is a manga series by Kaiji Kawaguchi.

During the cold war, the Japanese secretly develop a nuclear submarine. On its maiden voyage, the captain of the submarine declares the submaring to be an independent state, "Yamato."

An anime OVA series was later produced, the first two episodes of which were spliced together and released in North America as a single volume, which sold poorly. The rest of the series remained untranslated.