VIDEO: Indian submarine sinks with 18 sailors aboard

An Indian navy submarine with about 18 sailors on board caught fire after an explosion and sunk early Wednesday at its home port in Mumbai.
 

Efforts were being made to ascertain the safety of the personnel and salvage the diesel-powered submarine, navy spokesman Narendra Vispute said.
 

The vessel was submerged at its berth in the naval dockyard with only a portion visible above the surface.
 

Vispute said an explosion on the submarine caused a major fire.
 

The cause is being investigated.

The 16-year-old Russian-made submarine, INS Sindhurakshak, had recently returned from Russia after undergoing an overhaul and upgrade, Indian media reports said.