HMS Truculent was a British submarine of the third group of the T-class. She was built as P315 by Vickers Armstrong, Barrow, and launched on 12 September 1942. She sank nine enemy vessels. The submarine was funded by donations from the town of Glossop in Derbyshire, whose population raised £175,000 in 1942-3 to fund warships. Her bow struck a Swedish oil tanker outside the mouth of the Medway in January 1950. Held primarily responsible, Truculent began to sink – lost 64 men aboard as was ferrying workers as well as carrying her crew – and her wreck was towed to the destined nearby dockyard then sold for scrap. Regional navigation rules thereafter mandated a Truculent Light – a panoramic white light on the bow of submarines moving under their own power. Wartime service Truculent spent much of her World War II wartime service in the Pacific Far East, save for early 1943, operating on the European shelf. Here, in the Norwegian Sea she sank the German submarine U-308 with all hands on its first patrol. She took part in Operation Source, towing the X-class midget submarine X-6 to Norway to attack the heavy Kriegsmarine warships , and Lützow. On her transfer to the Pacific, she sank the Japanese army cargo ship Yasushima Maru; the small vessel Mantai; the merchant cargo ship, turned hell ship, Harukiku Maru with 180 of 720 POWs killed and five Japanese sailing vessels. She also laid mines, one of which damaged the . She survived the war and returned to the United Kingdom to continue in service with the Royal Navy. Sinking On 12 January 1950, Truculent was returning to Sheerness, having completed trials after a refit at Chatham. In addition to her peacetime complement, she was carrying 18 dockyard workers. She was delving into the Thames Estuary at night. At 19:00, a ship showing three lights appeared ahead. It was decided it must be stationary, and because Truculent could not pass to the starboard side without running aground, the order was given to turn to port. At once, the situation became clear; the Swedish oil tanker Divinaon passage from Purfleet and bound for Ipswichcame out of the darkness. The extra light indicated that she was carrying a very combustible cargo. The two collided, the Divina's bow striking Truculent by the starboard bow hydroplane, and remained locked together for a few seconds before the submarine sank.