The SET-40 (Russian: "СЭТ-40") is a Soviet 400 mm torpedo for primary use against submarines. The designation "СЭТ" stands for "Самонаводящаяся Электрическая Торпеда" (Guided Electrical Torpedo) and 40 stands for the diameter. It is an early Cold War-era ASW (anti-submarine warfare) torpedo of Soviet origin used by a few corvettes and frigates. An improvement over the previous MGT-1 passive homing torpedo and a needed weapon due to the Soviet Navy's need for a torpedo with small dimensions that could be mounted on submarines as well as small ships and boats that could not carry the larger and many times heavier 533 mm calibre weapons. But in the game, ships do not have to fight with submarines, but with enemy torpedo boats, sea hunters and larger ships — quite. Read more about the torpedo — in the article.