Russian TASS news agency has revealed some new details of ‘Poseidon’ underwater nuclear drone. The ‘Poseidon’, also known under Ocean Multipurpose System Status-6 or “Kanyon” by the U.S. intelligence community, is a new Russian strategic drone propelled by a miniaturized nuclear reactor. According to the news report, the maximum speed of the ‘Poseidon’ drone will be more than 107 kt (200 km/h), the maximum depth at which it can move is more than one kilometer. For comparison, the maximum speed of modern nuclear submarines is 32 kt, torpedoes – 48 kt. The high speed of ‘Poseidon’ will be made possible is due to supercavitation, whereby a gas bubble, which envelops the torpedo at maximum speed. – Defence Blog