India joins search for the submarine 




A deep submergence rescue vessel (DSRV) was dispatched by indian navy from Visakhapatnam to support the Indonesian Navy in the search and rescue efforts for its submarine KRI Nanggala that went missing with 53 personnel aboard.  


  • On April 21, an alert was received by the Navy through the International Submarine Escape and Rescue  Liaison Office (ISMERLO), regarding the missing Indonesian submarine.  
  • The submarine was reportedly exercising in a location 25 miles north of Bali.  
  • The DSRV departed by sea and has to cover a distance of approximately 2,500 nautical miles.  
  •  KRI Nanggala 402 was participating in a torpedo firing exercise when it went missing.  
  •  The submarine lost contact after being granted clearance to dive. The Indonesian Navy launched a massive search and rescue effort for the missing submarine and requested assistance from countries in the region.  
  •  The 53 personnel onboard are 49 crew members, three gunners and its commander.  

Advanced capability  

  • India is amongst the few countries in the world capable of undertaking search and rescue of a disabled submarine through a DSRV, the Navy said.  
  •  Indian Navy’s DSRV system can locate a submarine up to 1,000-metre depth utilising its state-of-the-art side-scan sonar and remotely operated vehicle.  
  • After the submarine is successfully located, another sub module of DSRV - the submarine rescue vehicle  (SRV) - links with the submarine to rescue the trapped personnel.  
  •  The SRV can also be used to provide emergency supplies to the submarine.  
  • The Singapore Navy has already pressed its rescue vessel while Australia too has offered assistance.  


INS Karanj  

  • Recently, Indian Navy’s third stealth Scorpene class (of Project-75) Submarine INS Karanj has been commissioned at the Naval Dockyard Mumbai.  
  • The previous INS Karanj (a Russian-origin submarine) was commissioned in 1969, at Riga in the erstwhile USSR.
  •  It had served the nation for 34 years up to 2003.  
  • The new INS Karanj would form part of the Western Naval Command’s Submarine fleet.  
  •  The ship’s name, Karanj, is believed to be derived from the Karanja island (also known as Uran Island), a town in Raigad district, which lies in the south-east of Mumbai Harbour.  
  • The Indian Navy has its base at Uran near Navi Mumbai.  

Project 75  

  • It is a programme by the Indian Navy that entails building six Scorpene Class attack submarines.  
  • It is given support by the Department of Defence Production (Ministry of Defence) and Indian Navy throughout its various phases of construction.  
  • The Mazagon Dock limited (MDL) is manufacturing six Scorpene submarines with technology assistance  from Naval Group of France under a USD 3.75 bn deal signed in October 2005.  
  •  MDL aptly called “Ship Builder to the Nation”, is one of India’s leading Defence public sector undertaking shipyards under the Ministry of Defence.

Other Submarines of the Ongoing Project-75  

  • Two submarines, Kalvari and Khanderi, have been commissioned into the Indian Navy.  
  •  The fourth Scorpene, Vela, has commenced its sea trials.  
  •  The fifth Scorpene ‘Vagir’ was launched in November 2020.  
  • The sixth and last submarine, Vagsheer, is being readied for boot together.  

Scorpene-Class Submarines  

  •  The submarines in the Project-75 Scorpene Class are powered by diesel-electric propulsion systems.  
  •  Scorpene is one of the most sophisticated submarines, capable of undertaking multifarious missions including anti-surface ship warfare, anti-submarine warfare, intelligence gathering, mine laying, and area surveillance.  
  • Scorpene is a conventional powered submarine (diesel-electric) weighing 1,500 tonnes and can go up to depths of 300m.  
  • The Scorpene class is the Navy’s first modern conventional submarine series in almost two decades since INS Sindhushastra, procured from Russia in July 2000.  
  • The Navy is looking to install Air Independent Propulsion (AIP) modules on all the Scorpene submarines to enhance endurance



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