Unmanned Diving Machine program (Japan)

[Grey Havoc]

Not much in the way of details yet. Apparently in the same class as the USN's XLUUV program, though requirements haven't been nailed down yet. Presumably will be operated by the MSDF, that is, if it ever manages to emerge from the unholy mess that is the Acquisition Technology and Logistics Agency.

https://www.japantimes.co.jp/news/2018/11/05/national/defense-ministry-develop-large-underwater-drone-monitor-remote-islands-government
https://thediplomat.com/2018/11/japan-plans-large-unmanned-submersibles/

 

[Ares]

According to the Japanese article, it will have more than 10 meters in length.

 

[Grey Havoc]

https://japannews.yomiuri.co.jp/politics/politics-government/20221027-67183/

 

[Grey Havoc]

On something of a tangent:
https://japannews.yomiuri.co.jp/politics/defense-security/20240417-180909/