Mumbai: The INS Sindhurakshak has completely sunk now. There is no information yet on the 18 sailors believed to be trapped inside. Naval divers have entered the submarine.
Here are the big developments in the story:
Indian Navy divers have entered the submarine, which has now completely sunk. Navy Chief Admiral DK Joshi has said there were three officers and 15 sailors on the vessel. He said a primary explosion ignited the ordnance on board the submarine which resulted in a second and larger explosion.
Defence Minister AK Antony and Maharashtra Chief Minister Prithviraj Chavan visited the harbor in Mumbai and assured all possible government assistance. Despite confirming the deaths of navy personnel in the morning, Mr Antony gave no such information during the press conference.
The accident comes just days after New Delhi trumpeted the launch of its first domestically -produced aircraft carrier, the INS Arihant, and the start of sea trials for its first Indian-made nuclear submarine.
The explosion on Wednesday has damaged another navy vessel, the INS Sindhuratna, berthed at the dockyard which is a colonial-era facility with civilian and military sections that employs more than 10,000 people.
Defence analysts say the major concern is of India's submarine capability depreciating fast. Of 14 diesel-powered submarines, 12 are operational. India has been expanding its armed forces rapidly to upgrade its mostly Soviet-era weaponry and react to perceived threats from regional rival China.