42-year-old Commander Kuntal Wadhwa died before reaching hospital after inhaling carbon dioxide that leaked from a malfunctioning unit just litte after noon when the Kolkata Class 'Yard-701' warship was undergoing tests in the Mazagaon Dock Limited (MDL), officials said.
Two employees of the defence ministry shipyard also were affected by the gas leakage and were taken to hospital. An MDL official said they have been discharged.
The fresh mishap, which came just nine days after fire and smoke in submarine INS Sindhuratna claimed lives of two officers, triggered demands for Defence Minister A K Antony's resignation.
Admiral Joshi had quit as Navy Chief after the Sindhuratna incident, which was the 10th in a series of such mishaps, taking "moral responsibility". Vice Admiral Robin Dhowan is currently the Acting Navy Chief.
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Preliminary inquiries into today's mishap suggested that the valve of firefighting equipment and Nuclear, Chemical and Biological Warfare capabilities of the warship burst when a specialist team was making checks, sources told PTI in Delhi.
Navy and the shipyard have set up separate boards of inquiry into the incident.