HMS Acheron (P411) was an Amphion-class submarine of the Royal Navy, constructed during the final years of World War II. She was laid down on 26 August 1944 and launched on 25 March 1947, with her completion occurring in 1948. As an Amphion-class vessel, she featured a displacement of approximately 1,360 long tons when surfaced and 1,590 long tons when submerged. Her overall length was 293 feet 6 inches (89.46 meters), with a beam of 22 feet 4 inches (6.81 meters) and a draught of 18 feet 1 inch (5.51 meters). Acheron was powered by two Admiralty ML eight-cylinder diesel engines, each generating 2,150 horsepower, which propelled her on the surface at speeds up to 18.5 knots. When submerged, her maximum speed was 8 knots, with an operational submerged range of 90 nautical miles at 3 knots or 16 nautical miles at 8 knots. Her surfaced range was extensive, capable of traveling up to 15,200 nautical miles at 10 knots, or 10,500 nautical miles at 11 knots, making her suitable for long-range patrols. The submarine was armed with ten 21-inch torpedo tubes—six at the bow and four at the stern—carrying a total of twenty torpedoes. Additionally, she was equipped with a QF 4-inch naval gun Mk XXIII, an Oerlikon 20 mm cannon, and a .303 British Vickers machine gun for surface combat and defense. Her complement consisted of sixty-one crew members. HMS Acheron participated in notable events, including the Coronation Review of the Fleet in 1953, celebrating Queen Elizabeth II’s coronation. She also conducted general naval service around the UK until the end of 1964. In February 1956, a geomagnetic storm caused radio communication issues, prompting a search after she lost contact. From August to December 1959, she undertook a cruise to South Africa and Pakistan. The vessel was decommissioned and dismantled in 1972 at J Cashmore’s yard in Newport, marking the end of her service.

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