Japanese submarines are naval vessels designed for underwater operations. They are primarily used for reconnaissance, surveillance, and combat missions. The Japan Maritime Self-Defense Force (JMSDF) operates a fleet of modern submarines, which are known for their advanced technology and stealth capabilities. These submarines typically feature air-independent propulsion systems, allowing them to remain submerged for extended periods. The Sōryū-class and Taigei-class are among the latest classes in service, showcasing Japan's commitment to maintaining a capable underwater fleet in response to regional security challenges.