With the successful launch of a K-4 from the Arihant's on-board silo, India steps closer to its nuclear triad. India's DRDO confirmed that its new SSBN and ICBMs are on schedule for 2015.

India on Thursday (Aug 29) formally commissioned its second Arihant-class submarine into its navy. The nuclear-powered submarine, INS Arighat, is considered an advanced version of its predecessor.

India’s second Arihant-class nuclear ballistic missile submarine (SSBN), INS Arighaat, was commissioned into the Indian Navy on 29 August. The new submarine brings India one step… ...

"According to our calculations, if we are to build six attack submarines based on the existing design of the Arihant, the cost would not exceed Rs 35,000 crore," a source involved in the process ...

Adding value to the third leg of India’s nuclear triad — and hence nuclear deterrent value — the SSBN mirrors its predecessor, INS Arihant, in size and propulsion. The boat, as submarines ...