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Japan’s Hypersonic Submarine Missiles: A Mach 5 Game-Changer in the Pacific

CLAVE 1 / 4Japan’s FY2027 defence budget includes ¥48 billion ($325 million) for research into an underwater vertical launch system for hypersonic missiles.

CLAVE 2 / 4The proposed missiles will travel at Mach 5 or faster, with a planned range of 1,620 nautical miles for the Type 25 Block 2B system.

CLAVE 3 / 4Japan’s Taigei-class submarines, currently equipped with 6 torpedo tubes, may serve as test beds for the new hypersonic capability.

CLAVE 4 / 4North Korea’s 8,700-ton submarine, inspected by Kim Jong Un in December 2025, has raised concerns over regional missile threats.

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