The News Minute | November 6, 2014 | 11:05 pm ISTA naval torpedo recovery vessel on Thursday sank outside the Visakhapatnam harbour, killing one personnel, navy officials said.Four more navy personnel were missing, while 23 were rescued safely. the officials said.The Torpedo Recovery Vessel (TRV) A-72 sunk off the coast of Visakhapatnam around 8 p.m on Thursday.Built by the Goa Shipyard Limited in 1983, the ship had served the Indian Navy for the last 41 years."Full scale search and rescue operations by Eastern Fleet ships is in progress to look for missing personnel," a navy official said.A statement from the navy said the vessel was on a routine mission to recover practice torpedoes fired by fleet ships during a routine exercise, when it experienced flooding in one of its compartments.At the time of the incident, there were 28 personnel on board."One sailor lost his life during the rescue operation and four personnel are reported missing. Twenty-three personnel have been rescued safely by the Search and Rescue (SAR) ships dispatched to the area," a navy statement said.TRV is an auxiliary vessel used to recover practice torpedoes fired by fleet ships and submarines.The ship was 23 metres long and 6.5 metres at the beam.IANS