Japan's Taigei-class submarine—the "Big Whale"—is the first submarine class designed entirely around lithium-ion batteries, abandoning traditional Air-Independent Propulsion altogether. At just $700 ...
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.
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