USSR's Project 670 Skat submarines used to be best in the worldUS specialists praise Soviet Project 670 Skat submarinesSoviet nuclear submarines of Project 670 Skat (NATO reporting name: Charlie I) were the best submarines of their time, The National Interest wrote. "The Soviet Navy affirmed bragging rights by designing what was the most advanced submarine in the world at that time: the Project 670 Skat (NATO reporting name: Charlie I-class) nuclear-powered cruise missile submarine," the article states. The first Project 670 submarine was launched in 1966. DetailsThe Soviet Navy was the naval warfare uniform service branch of the Soviet Armed Forces. The Soviet Navy included Naval Aviation, Naval Infantry, and the Coastal Artillery.