These are the later Type 613, which NATO calls it W Class. The W-class diving displacement is 1050 tons, and the underwater displacement is 1340 tons; the maximum length is 76 meters, the maximum width is 6.3 meters, and the average draft is 4.55 meters;

In 1946, the Soviet Union made a post-war development plan for the Soviet Navy . Decided to develop a medium-sized conventional submarine. These are the later 613 types, NATO is called W-level .

W class diving displacement is 1050 tons, and underwater discharge is 1340 tons; the maximum length is 76 meters, the maximum width is 6.3 meters, and the average draft is 4.55 meters; the power of two main engines is 4,000 horsepower, and the power of two motors is 2,700 horsepower; the water speed is 18 knots, and the underwater speed is 13 knots; the water endurance is 8,580 nautical miles/10 knots, and the underwater endurance is 335 nautical miles/2 knots. The extreme dive depth is 200 meters, self-sufficiency is 30 days and nights, and 52 crew members are present. The first is 4 torpedo launch devices and 2 torpedo launch devices, carrying a total of 12 torpedo .

W-class submarine has not made any military achievements, but after many modifications, it has conducted research and testing on navigation missile equipped with submarine ; it has also conducted tests on the new nuclear torpedo ; it has conducted self-floating life clock tests; it has conducted fuel cell tests, and conducted tests on replenishing fuel between submarines and submarines, making a significant contribution to the development of Soviet submarines.

W class submarine started construction in March 1950 and to the last delivery of the boat in June 1958, a total of 215 were built, making it the largest number of submarines in the world after World War II . Export to many countries. Indonesian 12 ships, Egyptian 10 ships, Syria 3 ships, Polish 4 ships, Bulgarian 2 ships, Albanian 3 ships and 5 ships in North Korea.

1954, the Soviet Union also transferred the technical information of W boats to my country, transferred the construction rights for a fee, provided complete sets of equipment and materials, and sent experts to my country to guide the construction. Training our country's submarine crews from a military perspective and learning to master the combat use of submarines. It has laid a solid foundation for my country to embark on the road of self-development of submarines in the later stage.