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Japan’s I-400 plan - The submarines built to hit the Panama Canal

After Pearl Harbor, Admiral Isoroku Yamamoto pushed for aircraft-carrying submarines designed to strike far from Japan. The I-400 series was built to travel enormous distances and launch bombers from ...
The Diplomat

Japan Launches 6th Taigei-Class Submarine for JMSDF

JS Sogei, the sixth Taigei-class submarine, entered the water in a ceremony held at KHI’s shipyard in Kobe City, Japan, Oct. 14, 2025. Credit: Japan Acquisition, Technology & Logistics Agency Japan’s ...
The Diplomat

Panel Urges Japan to Use ‘Next-Generation Propulsion Systems’ in New Submarines

JS Raigei, the fourth Taigei-class diesel-electric submarine with the Japan Maritime Self-Defense Force. Credit: The Japan Maritime Self-Defense Force (JMSDF) A Japanese Defense Ministry panel called ...