India on Sunday reached a milestone when Indian Prime Minister Manmohan Singh and his wife Gursharan Kaur launched the country's first indigenous nuclear-powered submarine 'INS Arihant' for sea trials. Ms. Kaur broke a coconut and performed a puja after which she unveiled a plaque naming the 112-metre-long submarine."I name it INS Arihant. All the best to the submarine," she said. Declaring that India has achieved a "historic milestone in the country's defence preparedness" with the launch of the submarine, the Prime Minister said, "We don't have any aggressive designs nor do we seek to threaten anyone. "We seek an external environment in our region and beyond that is conducive to our peaceful development and protection of our value systems," Singh said in his speech congratulating everyone associated with the advanced technology vessel (n-submarine) programme. Dr. Singh said, "Nevertheless, it is incumbent upon us to take all measures necessary to safeguard our country and to keep pace with technological advancements worldwide". With the sea trials, India has announced to the world that it possesses underwater platforms capable of launching nuclear weapons, completing its nuclear triad (land, air and sea) capability and strengthening its strategic deterrence. It also made its entry into an elite club of nations comprising the US, Russia, France, the UK and China which possess capabilities to develop nuclear submarine.