Japanese submarines are naval vessels designed for underwater operations, primarily used by the Japan Maritime Self-Defense Force. They are known for their advanced technology, stealth capabilities, and efficient design. These submarines play a crucial role in Japan's defense strategy, focusing on surveillance and deterrence in the Pacific region. The most notable class of Japanese submarines is the Sōryū-class, which features air-independent propulsion systems, allowing them to remain submerged for extended periods. Japan has also developed the Taigei-class, which incorporates modern technologies for improved performance and operational flexibility, enhancing Japan's maritime security.