The vessel is the first ballistic missile submarine to be built outside the five recognized nuclear powers — the United States, France, Russia, Britain and China.
Rahul Bedi, an analyst for the independent Jane's Information Group, said the submarine would now undergo sea trials. The vessel has been undergoing harbor trials in eastern India.
Last year, India acquired a Russian Nerpa nuclear submarine for its navy on a 10-year lease from Russia at a total cost of nearly $1 billion.
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