Japan's JMSDF Commissions Fifth Taigei-Class Submarine JS Chōgei for Indo-Pacific Operations
On March 10, 2026, the Japan Maritime Self-Defense Force commissioned the JS Chōgei (SS 517), the fifth Taigei-class submarine. Built by Mitsubishi Heavy Industries, the submarine has a standard displacement of 3,000 tonnes. It is part of a series of eight submarines aimed at renewing Japan's fleet. The project cost 64.8 billion yen ($443 million) and is set to enhance Japan's underwater capabilities in the Indo-Pacific region.
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The Japan Maritime Self-Defense Force commissioned the JS Chōgei (SS 517) on March 10, 2026, marking its fifth Taigei-class submarine. The vessel, measuring 84 meters and displacing 3,000 tonnes, will enter operational service in March 2026 and is part of a planned fleet renewal comprising eight submarines.
Constructed at Mitsubishi Heavy Industries with a budget of 64.8 billion yen, it features advanced propulsion systems, improved sonar capabilities, and lithium-ion battery technology. The JS Chōgei is assigned to Yokosuka Naval Base and incorporates design modifications for mixed-gender crews, reflecting personnel policy changes in Japan's defense forces.
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