JS Raigei SS-516 – World’s Most Advanced Diesel Submarine? Full Analysis

Описание: JS Raigei SS-516 – World’s Most Advanced Diesel Submarine? Full Analysis
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Welcome to SB Review 6. In today’s detailed video, we explore Japan’s latest submarine JS Raigei (SS-516), commissioned in 2025 as the newest unit of the Ouryu-class diesel-electric submarines. This submarine review covers its advanced exterior stealth design, innovative interior ergonomics for crew comfort, powerful performance with lithium-ion battery propulsion, and its estimated cost analysis.

JS Raigei stands as a symbol of Japan’s cutting-edge naval engineering. With a length of approximately 84 meters and submerged displacement of 4,200 tons, it features enhanced stealth through its sound-absorbing tiles, an advanced sonar evasion hull shape, and reduced radar cross-section mast designs. Its interior is equipped with a fully integrated tactical command system, touch panel combat displays, ergonomically arranged crew seats, and optimized living quarters to minimize fatigue during long-term missions.

Unlike previous Soryu-class submarines, Raigei employs high-capacity lithium-ion batteries instead of AIP Stirling engines, allowing longer submerged endurance and faster charging cycles while ensuring safety with advanced fire prevention systems. Powered by a 1-shaft 7-blade propeller, its underwater speed reaches around 20 knots with a maximum operational depth beyond 500 meters. It carries up to 30 Type-18 torpedoes and UGM-84 Harpoon anti-ship missiles.

Its construction cost reaches approximately 800 billion yen (around USD 5 billion), while lifetime operational costs exceed 2 trillion yen. This investment underscores its strategic value in Japan’s maritime self-defense capabilities, deterring regional threats effectively.

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