India successfully test-fired the 3,500-kmrange submarine-launched ballistic missile, K-4, official sources confirmed. The test was carried out by the Defence Research and Development Organsiation (DRDO) from a submerged pontoon off the Visakhapatnam coast around noon. INS Arihant, the first and only operational SSBN, is armed with K-15 Sagarika missiles with a range of 750 km.
