The French shipbuilder, which earlier this year won a A$50 billion ($38.06 billion) contract to build Australia’s next generation submarines, has suffered a massive data leak, raising doubts about the security of one of the world’s biggest defence projects.

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France’s DCNS Group beat out Germany’s ThyssenKrupp AG and a Japanese-government-backed bid by Mitsubishi Heavy Industries and Kawasaki Heavy Industries, in a blow to Japanese Prime Minister Shinzo Abe’s push to develop defence export capabilities as part of a more muscular security agenda.

A leak, which runs to 22,400 pages and seen by The Australian (Australian newspaper) details the ­entire secret combat capability of the six Scorpene-class submarines being built for the Indian Navy by French shipbuilder Direction des Constructions et Armes Navales (DCNS).