SM U-39 was a German Type U 31 submarine constructed during World War I, notable for its significant combat record and technological features. The vessel measured approximately 64.70 meters (212 feet 3 inches) in overall length, with a pressure hull length of 52.36 meters (171 feet 9 inches). Its beam was 6.32 meters (20 feet 9 inches), and it had a draught of 3.56 meters (11 feet 8 inches). Displacing 971 tonnes (956 long tons) on the surface and 878 tonnes (864 long tons) submerged, U-39 was a double-hulled ocean-going submarine designed for high-sea operations. Powered by two Germania 6-cylinder diesel engines delivering 1,850 metric horsepower for surface travel, and Siemens-Schuckert electric motors producing 1,200 PS for submerged movement, U-39 could reach a top surface speed of 16.4 knots and a submerged speed of 9.7 knots. Its cruising range was extensive, offering 8,790 nautical miles at 8 knots on the surface, and 80 nautical miles at 5 knots underwater. The submarine's operational diving depth was 50 meters. Armament included four 50 cm torpedo tubes—two at the bow and two at the stern—carrying a total of six torpedoes, along with a deck gun initially armed with an 8.8 cm gun, later replaced by a 10.5 cm gun during 1916/17. The crew comprised four officers and 31 enlisted men. Operationally, U-39 departed Pola in April 1918 under Kapitänleutnant Heinrich Metzger for the Western Mediterranean. It achieved notable success, sinking 149 merchant ships totaling over 404,774 GRT, making it the second most successful U-boat of the war. Its most prominent engagement occurred near Oran, where it sank the British steamer Sculptor. However, on 18 May 1918, U-39 was attacked by French seaplanes, sustaining critical damage that led to it sinking by the stern after multiple bombings. The crew managed to reach the Spanish port of Cartagena, where the submarine was interned for the war's duration. Following the armistice, U-39 was surrendered to France in 1919 and was dismantled at Toulon in 1923. Its service exemplifies the strategic and technological capabilities of German U-boats during World War I and highlights its role in maritime warfare in the Mediterranean.

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