10 August 2013
Updated at 13:53 ET
Indian-built Arihant nuclear submarine activated
Gursharan Kaur, the wife of Indian Prime Minister Manmohan Singh, breaks a coconut on the hull of India's first nuclear-powered submarine INS Arihant in 2009
The prime minister's wife helped unveil the Arihant in a ceremony in 2009
Related Stories
India widens nuclear horizons
Russian-made sub joins India navy
India's reliance on Russian arms
India has activated the reactor on board the INS Arihant nuclear submarine, the first to be designed and built in India.
link-
http://www.bbc.co.uk/news/world-asia-india-23648310