High Quality Content by WIKIPEDIA articles! The Arihant class submarines are nuclear-powered ballistic missile submarines being developed for the Indian Navy. The INS Arihant, was introduced to the public on July 26, 2009 at a symbolic launch ceremony, which consisted of floating it by flooding the dry dock. It was reported that the Arihant was not complete shortly after its launch, and that key systems including its nuclear reactor, surveillance equipment, sensors, weapons, and ordinance were still in the process of being installed. Other reports have stated that the reactor is on board the submarine.