<P> The lighter and tougher RV body has an all - carbon composite re-entry heat shield with multi-directional carbon re-entry nose tip and control surfaces . The new lightweight composites can withstand temperatures of up to 6000 degrees Celsius, and are capable of greater re-entry velocity . </P> <P> The K - 4 missile is one of the series of missile developed under the K-X series . DRDO is working on a submarine - launched version of the Agni - III missile, which will provide India with a credible sea - based second - strike capability . The K - 4 missile, with a range of 3500 km, has been test - fired successfully multiple times - both from underwater pontoons and from INS Arihant . The K - 4 SLBM is expected to be the principal intermediate range missile for the Arihant class nuclear submarines . An as - yet unnamed variant of K - 4 with 5000 km range is under development . </P> <P> The first test for Agni III was conducted from Abdul Kalam Island (then known as Wheeler Island) off the Bhadrak coast on 9 July 2006 . The launch proved to be unsuccessful, with the missile falling into the sea off the coast of Odisha, short of reaching the target . According to DRDO, the failure was due to a first stage anomaly that was caused by recirculating hot gases entering the missile - base shroud and damaging the electronic components . Indian Defence Minister Pranab Mukherjee reported it as "partial success" (a trade euphemism to indicate the test generated useful data for diagnosis and correction) as the missile was air - borne for only 5 minutes instead of the expected 15 minutes . </P> <P> Agni - III was test fired again on 12 April 2007, from the Abdul Kalam Island off the coast of Odisha . This time, the launch was declared as a success . India's Cabinet Committee on Security announced that "This test confirms the extent of India's nuclear reach and India's nuclear deterrence as the missile can accurately hit targets at distance more than 3000 km away". </P>

Where did the agni-iii test launch and failed