Moscow: Russia has handed over the much- awaited nuclear-powered attack submarine Nerpa to India on a 10-year lease, boosting the Indian navy's fire-power. The Akula-II class Nerpa nuclear submarine had recently finished sea trials. "The signing ceremony happened yesterday at the Bolshoi Kamen ship building facility in the (Far East) Primorye region where the Nerpa is now based," ITAR-TASS news agency quoted a senior Russian navy official as saying. The deal for the submarine, which is being transferred on a 10-year lease, was worth USD 920 million. The report said an Indian crew would sail the Akula II class craft to its home base at the end of January. "All of the naval tests and performance checks have been completed," the Russian navy official said. The submarine, capable of remaining underwater for months, will be rechristened as 'INS Chakra' and it would be for the first time in more than two decades that the Indian navy would have