HMS Sturdy was an S-class submarine of the third batch built for the Royal Navy during World War II. She measured 217 feet (66.1 meters) in overall length, with a beam of 23 feet 9 inches (7.2 meters) and a draft of 14 feet 8 inches (4.5 meters). The vessel displaced 842 long tons (856 tons) on the surface and 990 long tons (1,010 tons) when submerged. Her crew comprised 48 officers and ratings, and she was designed to operate at a maximum diving depth of 300 feet (91.4 meters). Her propulsion system included two 950-brake-horsepower (708 kW) diesel engines for surface running, each powering a propeller shaft, and two 650-horsepower (485 kW) electric motors for submerged operation. She could reach speeds of 15 knots (28 km/h; 17 mph) on the surface and 10 knots (19 km/h; 12 mph) underwater. The submarine had an extensive range of 7,500 nautical miles (13,900 km; 8,600 miles) at 10 knots when surfaced, and a submerged range of 120 nautical miles (220 km; 140 miles) at 3 knots. Armament consisted of seven 21-inch (533 mm) torpedo tubes—six in the bow and one external in the stern—carrying a total of thirteen torpedoes, with an option to carry twelve mines instead of torpedoes. Additionally, she was equipped with a 3-inch (76 mm) deck gun for surface combat. Built by Cammell Laird, HMS Sturdy was launched on 30 September 1943. During her wartime service, she primarily operated in the Pacific Far East, sinking multiple Japanese vessels, including eleven sailing ships, two tugboats, three barges, fishing vessels, landing craft, communication vessels, and merchant ships such as Kosei Maru and Hansei Maru. She survived the war and continued her service post-war, notably visiting Rønne on the Danish island of Bornholm in July 1956. The submarine was sold in July 1957 and was broken up at Clayton and Davy's yard in May 1958. Her operational history highlights her role in Allied naval efforts during WWII and her contribution to maritime warfare in the Pacific theater.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.