much fuel. To contain all of these changes the hull was larger, and the surface and submerged displacement was more than double that of the UB I boats. The Imperial German Navy ordered UB-47 from AG Weser on 31 July 1915 as the final boat of a series of six UB II boats (numbered from to UB-47), and the last UB II submarine numerically. UB-47 was long and abeam. She had a single hull with saddle tanks and had a draught of when surfaced. She displaced while submerged but only on the surface. The submarine was equipped with twin Daimler diesel engines and twin Siemens-Schuckart electric motors—for surfaced and submerged running, respectively. UB-47 had a surface speed of up to and could go as fast as while underwater. The U-boat could carry up to of diesel fuel, giving her a range of at . Her electric motors and batteries provided a range of at while submerged. UB-47 was equipped with two bow torpedo tubes and could carry four torpedoes. The U-boat was also armed with one Uk L/30 deck gun. UB-47 was laid down by AG Weser at its Bremen shipyard on 4 September 1915. As one of six U-boats selected for service in the Mediterranean while under construction, UB-47 was broken into railcar-sized components and shipped overland to the Austro-Hungarian port of Pola. Shipyard workers from Weser assembled the boat and her five sisters at Pola, where she was launched on 17 June. German Imperial Navy career SM UB-47 was commissioned into the German Imperial Navy on 4 July 1916 under the command of Oberleutnant zur See Wolfgang Steinbauer. UB-47, Steinbauer's first U-boat command, was assigned to the Navy's Pola Flotilla () in which she remained throughout her German career. Although the flotilla was based in Pola, the site of the main Austro-Hungarian Navy base, boats of the flotilla operated out of the Austro-Hungarian base at Cattaro which was located farther south and closer to the Mediterranean. German U-boats typically returned to Pola only for repairs. On 17 August, Steinbauer and UB-47 achieved their first success when they sank the Italian steamer south of Cape Matapan. Although Italy and Germany would not formally be at war for another ten days, German U-boats in the Mediterranean routinely attacked Italian vessels by posing as Austro-Hungarian submarines and flying the ensign of that country's navy. Stampalia was an ocean liner of that