The K-31 is a type of submarine used by the Soviet Navy during the Cold War. It is part of the Project 641 class, which was designed for anti-submarine warfare and reconnaissance missions. The K-31 features a conventional diesel-electric propulsion system, allowing it to operate underwater for extended periods. This submarine is equipped with torpedoes and can carry out various naval operations. The K-31, like other submarines in its class, has a streamlined hull for improved underwater performance. Its design reflects the technological advancements of its time, making it a significant asset in naval strategy during its operational years.