Highly sensitive data related to India’s Scorpene submarines has been leaked, with French shipbuilder DCNS, which designed the submarine, facing a leak of documents spreading over 22,000 pages, a report in Australian media revealed on Tuesday. The data tells the submarine crew where they can speak safely to avoid detection by the enemy. It also discloses magnetic, electromagnetic and infrared data as well as the specifications of the submarine’s torpedo launch system and the combat system, the report further stated. The Scorpenes, being built for 3.5 billion dollars at the Mazegaon docks at Mumbai, are considered some of the most advanced of their class in the world. They are so silent underwater that they are extremely difficult, if not impossible to detect. But now their sonar capabilities, the noise they generate and details of the combat system they are armed with are totally exposed.

The leaked documents were marked "Restricted Scorpene India", the Australian newspaper said. Among the 22,400 pages of leaked documents were also thousands of pages on the Scorpene's sensors and thousands more on its communication and navigation systems. As many as 500 pages were on the torpedo launch system alone. The data includes 4,457 pages on the submarine’s underwater sensors, 4,209 pages on its above-water sensors, 4,301 pages on its combat management system, 493 pages on its torpedo launch system and specifications, 6,841 pages on the sub’s communications system and 2,138 on its navigation systems.