The Russian Navy Report

 K-152

     The Nerpa is an Akula II class submarine that has now been leased to the Indian Navy for a period of 10 years. This was a deal that was many years in the making, with coutless delays, and it's interesting that this isn't the first time that a nuclear powered vessel has been transferred between navy's ( K-43 a Charlie class SSGN was leased to the Indian Navy as the Chakra from 1988 to 1992).

 

      The submarine was originally laid down in 1993 at Komsomolsk-on-Amur. Because of financial difficulties and the loss of specialist's the submarines construction was delayed. Construction did not begin again until 2004 when it was reported that the Indian Navy expressed interest in acquiring the ship. For the next several years there were many conflicting reports about if the ship was going to serve with the Russian Navy or with the Indian Navy. Still there were many delays, and the submarine didn't start sea trials until 2008.

     
While on sea trials in 2008, a fire suppression system went off and killed 20 people and injuring many more. This was the worst submarine accident in the Russian Navy since the Kursk.

 The ship was returned to the ship yards to undergo further repairs.

 

     Finally in late 2009 the submarine was commissioned into the Russian Navy. An Indian crew was being trained at this time to eventually take over operations on board the submarine. The transfer was completed at the end of 2011, and the submarine was renamed INS Chakra.

 Here are some of the specifications according to RIA Novosti: