These seven sailors had to be air lifted to the hospital as they had inhaled a large amount of smoke. The Defence Minister AK Antony had briefed President of Armed Forces, Pranab Mukherjee and Prime Minister Manmohan Singh today’s accident. ‘Taking moral responsibility for the accidents and incidents which have taken place during the past few months, the Chief of Naval Staff Admiral D K Joshi today resigned from the post of Navy Chief,’ Defence Ministry said. ‘The Government has accepted the resignation of Admiral Joshi with immediate effect,’ it said. This mishap took place about 50 km off the Mumbai coast while the submarine was on a routine training exercise. ‘The deputy electrical officer (a lieutenant commander) and the watch keeping officer (a lieutenant) are missing. Compartments get sealed automatically when the fire-fighting system kicks in,’ revealed a source.