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HMS Sea Nymph was a S-class submarine of the third batch built for the Royal Navy during World War II. Completed in July 1942, she spent the majority of her career patrolling the waters off Norway in the North Sea, then was sent to the Pacific but was forced back due to technical problems.
After three uneventful patrols in the North Sea, the boat conducted one patrol in the Bay of Biscay, attacking two surfaced German U-boats with torpedoes, but missed. The submarine then participated in Operation Source, an attempt to sink German battleships in Norway threatening allied Arctic convoys. Sea Nymph was assigned to tow the midget submarine X8 to off the fjord where the Tirpitz was anchored. While at sea, X8 was scuttled due to technical issues, and the mission was cancelled. The submarine was then tasked with transporting British agents to a fishing vessel off Norway. In her next two patrols, the boat fired torpedoes on three German merchant ships, but missed every attack. In March 1944, Sea Nymph was sent to the United States for a refit; she returned in October, then after an uneventful patrol, she had her battery changed. With Nazi Germany close to defeat, the submarine was ordered to the Pacific, where war with the Japanese was also ongoing. She had to turn back and have her battery replaced again after encountering problems; after arriving in the Philippines, on 13 July Sea Nymph caught on fire and was damaged beyond the repair capabilities of local shipyards. She was sent back to Great Britain, but as the war with Japan ended, she was not repaired but placed in reserve. Sea Nymph was scrapped in Troon, Scotland in June 1948.

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