Moving a step closer tocompleting its nuclear triad, India on Sunday successfully test fired a ballistic missile, with a strike range of around 1,500 kilometres, from an underwater platform in Bay of Bengal.

"The medium range K-5 ballistic missile was test fired successfully today from an underwater pontoon and all parameters of the test firing were met," DRDO chief VK Saraswat told PTI from the undisclosed test area.

Nuclear triad is the ability to fire nuclear-tipped missiles from land, air and sea.

Saraswat said that the development phase of the K-5 missile, which is a submarine-launched ballistic missile (SLBM), was over and it was now ready for deployment on various platforms including the indigenous nuclear submarine INS Arihant which is under development.