HMS Narwhal (N45) was a Grampus-class mine-laying submarine of the Royal Navy, built by Vickers-Armstrongs in Barrow and launched on 29 August 1935. As part of her class, she was designed for laying mines and engaging in wartime patrols, with a focus on disrupting German naval operations during World War II. Throughout her brief wartime service, HMS Narwhal demonstrated notable activity in home waters. In February 1940, she participated in anti-submarine operations, helping to sink the German U-boat U-63 southeast of the Shetland Islands alongside HMS Imogen and Inglefield. In May of the same year, she torpedoed and sank the German troop transport Buenos Aires and damaged another, Bahia Castillo, which was ultimately declared a total loss despite reaching port. Most of HMS Narwhal's wartime achievements involved laying mines that resulted in the sinking of numerous German vessels. Her mines caused the loss of several German auxiliary minesweepers, minesweepers, auxiliary submarine chasers, armed trawlers, and cargo ships, including M 1302/Schwaben, M 1102/H.A.W. Möllerthe, Gnom 7, Kobold 1, Kobold 3, M 11, UJ D/Treff VIII, V 1109/Antares, and the Swedish cargo ship Haga. Additionally, ships such as the armed trawler V 403/Deutschland, Togo, Clara M. Russ, M 1101/Fock & Hubert, and Palime were damaged by her mines; several of these were beached but declared total losses. Notably, while credited with sinking the Norwegian fishing vessel Arild, this was actually caused by a German mine, not Narwhal. HMS Narwhal also is suspected to have sunk the German U-boat U-1, which disappeared on patrol in April 1940, potentially having navigated through mines laid by Narwhal earlier. Alternatively, her sister ship Porpoise reported firing upon an unidentified submarine, possibly U-1. Narwhal's service ended abruptly when she left Blyth on 22 July 1940. The following day, a German aircraft reported attacking a submarine in her area of operation. Believed to be Narwhal, this attack likely sank her, as she failed to report again. In 2017, a Polish expedition identified a wreck in the North Sea as most likely HMS Narwhal, based on sonar data, confirming her loss.

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