A submarine of the Japan Maritime Self-Defense Force collided with a US nuclear submarine off the coast of Japan and sank. Shock spreads at the news that all 76 people, including the captain, Shiro Kaieda, were killed. However, in fact, the crew survived. The accident was a cover-up to allow them to board the high-performance nuclear submarine "Seabat", which was built in secret by the Japanese and US governments. The Seabat became a member of the US fleet, and Kaieda, who boasted the best maneuvering ability in the JMSDF, was appointed captain. However, Kaieda loads nuclear missiles onto the Seabat and suddenly rebels and flees. He declares to the world that Yamato is an independent fighting nation with Kaieda as its head of state. America designates Yamato as a nuclear terrorist and assembles its Pacific fleet to sink it. The JMSDF diesel ship Tatsunami pursues Yamato in an attempt to capture it before America does. Its captain, Fukamachi, has strong feelings for Kaieda due to a past shipwreck... is it arighteous cause or treason? What is Kaieda Shiro's purpose in engulfing the Japanese and US governments, the Maritime Self-Defense Force, and even the US Navy in the raging waves of fate? (Source: Japanese = Amazon-press.jp || Translation = MyDramaList) ~~ Adapted from the manga series "Chinmoku no Kantai" (沈黙の艦隊) by Kawaguchi Kaiji (川口開治).