HMCS Windsor is a long-range hunter-killer (SSK) submarine of the Royal Canadian Navy, the second submarine of the Victoria class. She is named after the city of Windsor, Ontario. Built for the Royal Navy as the Upholder-class submarine HMS Unicorn (pennant number S43) she was purchased by Canada when the United Kingdom decided to move to an all-nuclear power fleet. During the refit for Canadian service, the submarines were equipped with the Lockheed Martin Librascope Submarine fire-control syst

Dosan Ahn Changho-class submarine was developed for the Republic of Korea Navy as part of the third phase of Korean Attack Submarine (KSS-III) program. It is notable for being one of the very few non-nuclear submarines capable of launching submarine-launched ballistic missiles (SLBM). Displacing at around 3,800 tons (submerged), Dosan Ahn Changho-class submarine features an Air Independent Propulsion (AIP) which enables it to operate for three weeks while submerged. It is armed with 6x torpedo t