You would have heard about INS Arihant, India's first made-in-India ballistic missile submarine, having completed its first operational deployment. On Trending @ 10, we try and bring you details of just what the Arihant is all about and what a naval nuclear deterrence achieves. We bring you details of the nuclear tipped missiles that INS Arihant is armed with, how India built its nuclear reactor and the future of this programme. India's desire to build a ballistic missile submarine capability is more than three decades old. And what we are now seeing is the coming of age of the most sophisticated military programme in India's history.