Two sailors who were missing are now dead , authorities say . The Indian navy declined to provide an exact number of how many incidents had taken place on vessels in recent months , saying only that there had been `` a couple of serious accidents involving submarines . '' Seven other sailors are hospitalized after toxic smoke on a submarine . The chief of the submarine has stepped down following a series of problems on vessels . In August , an explosion on another Indian submarine killed all 18 sailors on board .
Two sailors who were missing are now dead , authorities say . Seven other sailors are hospitalized after toxic smoke on a submarine . The chief of the submarine has stepped down following a series of problems on vessels . In August , an explosion on another Indian submarine killed all 18 sailors on board .