Western Navy Commander Vice Admiral Shekhar Sinha, who was superseded by Admiral Robin Dhowan in the appointment of Navy chief on Thursday, is understood to be unhappy and is contemplating putting in his papers.
India, Japan and the US are set to focus on "anti-submarine warfare" by deploying "different machines" during the next round of their marine wargames named the Malabar Exercise, amidst increasing presence of Chinese underwater vessels in the strategic Indian Ocean region.
Robin K Dhowan on Thursday took over as chief of the Indian Navy nearly two months after D K Joshi quit the post in the wake of a series of mishaps.
The leaked documents include details of submarine's underwater sensors, above-water sensors, combat management system, torpedo launch system and specifications, communications system and navigation systems.