INS Arihant ( Image credits- DRDO/ Indian Navy) Source- The Russia & India Report Author- Rakesh Krishnan Simha In June 2012 a nuclear-powered attack submarine of the Russian Navy quietly entered the Gulf of Mexico. Armed with long-range nuclear cruise missiles, the Akula class vessel operated undetected for several weeks and its movement in strategic US waters was only confirmed after it left the area. The silent Akula left a lot of red faces in the American defence establishment in its wake. In November 2013 Russia launched its advanced stealth diesel-electric Novorossiysk . The Project 636 submarine is said to be virtually undetectable when submerged. “Our potential opponents call it the ‘Black Hole’ due to the very low noise emission and visibility of the submarine,” Konstantin Tabachny, the captain of the Novorossiysk , told the media. “To be undetectable is the main quality for a submarine. And this whole project really fits its purpose.” After deca