During World War II, Japan developed one of the most ambitious naval weapons of the conflict—the I-400 Sen-Toku class submarine carriers. These massive submarines, the largest of WW II, were designed ...
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. The Taigei class are Japan’s newest diesel-electric submarines.