HMS Ambush (P418/S68/S18) was an Amphion-class submarine constructed for the Royal Navy by Vickers Armstrong, launched on 24 September 1945, and completed on 22 July 1947. She measured 293 feet 6 inches (89.46 meters) in length, with a beam of 22 feet 4 inches (6.81 meters) and a draught of 18 feet 1 inch (5.51 meters). Displacing 1,360 long tons (1,380 tons) on the surface and 1,590 long tons (1,620 tons) submerged, Ambush was powered by two Admiralty ML eight-cylinder diesel engines producing 2,150 horsepower each, supplemented by four electric motors (each 625 horsepower) for submerged propulsion. Her maximum surface speed was 18.5 knots, while submerged speed was 8 knots. Operational range was substantial, with the ability to travel over 15,200 nautical miles at 10 knots on the surface and submerged endurance of 90 nautical miles at 3 knots. Armament included ten 21-inch torpedo tubes (five bow and five stern), capable of carrying twenty torpedoes, along with a QF 4-inch naval gun Mk XXIII, an Oerlikon 20 mm cannon, and a .303 British Vickers machine gun. Her complement consisted of 61 crew members. Ambush’s service history included participation in post-war trials of the submarine snorkel in 1948, notably during an Arctic submerged cruise that was interrupted by a severe storm. She was also involved in a notable event in 1951 when she heard and decoded a distress message from HMS Affray, which was later sunk with all hands lost. The submarine participated in the Fleet Review celebrating Queen Elizabeth II’s coronation in 1953. From November 1959, Ambush joined the 10th Submarine Flotilla based in Singapore, operating in the Far East until July 1967. Decommissioned in the late 1960s, HMS Ambush was sold for scrap to Thos. W. Ward, arriving at Inverkeithing for dismantling on 5 July 1971. Her service exemplifies the post-World War II evolution of Royal Navy submarines, particularly in Arctic and Far Eastern operations.

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