The Japan Maritime Self-Defense Force has expanded its undersea warfare toolkit with the addition of a new domestically developed unmanned underwater vehicle, reinforcing Japan’s focus on modernizing its maritime defense posture. Images released by the JMSDF show at least six UUVs in service, although the exact deployment location remains undisclosed.
The newly fielded platform has not been officially named, but reports suggest it shares the 533-millimeter form factor commonly associated with heavyweight torpedoes. This configuration allows the UUV to be launched and recovered through submarine torpedo tubes, offering flexibility and stealth for undersea missions.
Intended for maritime surveillance, subsea monitoring, and security operations, the system highlights Japan’s broader effort to integrate unmanned and autonomous technologies into its naval forces. The JMSDF stated that expanding unmanned capabilities is a key element of enhancing deterrence and rapid response in an increasingly complex regional security environment.
The UUV program traces its origins to 2019, when Japan’s Ministry of Defense and ATLA initiated development of two separate designs. IHI Corporation developed one variant, known as Type-1, while Mitsubishi Heavy Industries oversaw the Type-2 platform. The first production units were ordered in 2021, signaling Japan’s long-term commitment to unmanned undersea systems.
