Japan commissions fifth Taigei-class submarine

JS Chogei , the fifth of eight Taigei-class submarines that have either been commissioned, contracted, or approved for acquisition. (ATLA)

Japan has commissioned its fifth Taigei-class diesel‑electric attack submarine, JS Chogei.

The submarine was formally inducted into service following a handover and ensign presentation ceremony held on 10 March at Mitsubishi Heavy Industries' (MHI's) Kobe Shipyard, Japan's Acquisition, Technology & Logistics Agency (ATLA) announced on 11 March.

Chogei is the fifth unit in an eventual fleet of eight Taigei-class submarines ordered to recapitalise Japan's conventional undersea forces.

The class succeeds the long‑running Sōryū series and incorporates upgraded propulsion systems, new-generation sensors, and enhanced acoustic stealth.

The Taigei class displaces approximately 3,000 tonnes, measures 84 m in length with a 9.1 m beam and a 10.4 m draught, and carries a crew complement of about 70.

The vessel also includes dedicated living spaces for female crew members, making Taigei the first Japanese submarine class with such facilities integrated from inception.

In terms of combat capability, Chogei is armed with six 533 mm bow tubes capable of deploying the Type 89 wire‑guided torpedo, and is expected to integrate the newer Type 18 heavyweight weapon as it enters fleet service.

The submarine can also launch UGM‑84L Harpoon anti‑ship missiles.

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Japan launches fifth Taigei-class submarine