Visakhapatnam: India on Sunday successfully test-fired the 3,500-km range submarine-launched ballistic missile, K-4, official sources confirmed.
The test was carried out by the Defence Research and Development Organisation (DRDO) from submerged pontoon off the Visakhapatnam coast on Sunday afternoon.
K-4 is one of the two underwater missiles currently being developed by India for its submarine force while the other one is BO-5 with a strike range of over 300 kilometre.
The development of the K-4 was undertaken after facing significant difficulties in compacting similarly capable Agni-III to equip INS Arihant which has a limited 17-metre (56 ft)-diameter hull. K-4 has range comparable to Agni-III with major length reduction from 17 metres (56 ft) to 12 metres (39 ft). The gas-booster designed for K-4 was successfully tested from a submerged pontoon in 2010.