History's Most Costly Military Vehicles Revealed

8. Soryu Class Submarine – Japan

Producer: Kawasaki Shipbuilding Corporation and Mitsubishi Heavy Industries The Japan Maritime Self-Defense Force serves as the primary operator. Each unit costs $6.1 million. The Soryu-class submarines operate as diesel-electric attack vessels used by the Japan Maritime Self-Defense Force. Introduced in 2009, the Soryu-class represents an enhanced version of the Oyashio-class submarines and includes an X-shaped stern for improved maneuverability.

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Chinese Submarine of the Soryu Class ©commons.wikimedia.org The Soryu-class marks Japan's first submarine to include air-independent propulsion, enabling it to stay submerged for extended durations. Its Stirling engines, produced by Kawasaki, and lithium-ion batteries distinguish it as an advanced vessel.