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 on Thursday at the Bolshoi Kamen ship building facility in the Primorye region where the Nerpa is now based, a senior Russian navy official was quoted as saying.

The deal for the submarine, which is being transferred on a 10-year lease, was worth $ 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 a nuclear attack submarine.

When Russia makes the delivery, it will make India only the sixth operator of nuclear submarines in the world.

The submarine deal had figured during Prime Minister Manmohan Singh's visit to Russia earlier this month.

The Nerpa had originally been scheduled for delivery in 2008 but an accident during sea trials on November 8 that year, which had killed 22 people, mostly civilians, had forced the Russian authorities to put it on hold. It was one of Russia's worst naval accidents.

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