RMS Mauretania (1906) launched by the Duchess of Roxburghe. At the time of her launch, she was the largest moving structure ever built, and slightly larger in gross tonnage than "Lusitania". The main visual differences between "Mauretania" and "Lusitania" were that "Mauretania" was five feet longer and had different vents. "Mauretania" also had two extra stages of turbine blades in her forward turbines, making her slightly faster than "Lusitania". "Mauretania" and "Lusitania" were the only ships with direct-drive steam turbines to hold the Blue Riband; in later ships, reduction-geared turbines were mainly used. "Mauretania"s usage of the steam turbine was the largest application
German submarine U-657 sank one merchant ship, for a total of . "U-657" took part in six wolfpacks, namely "U-657" was sunk on 17 May 1943 in the North Atlantic, E of Cape Farewell, Greenland, in position , by depth charges from Royal Navy frigate . All hands were lost. German submarine U-657 German submarine "U-657" was a Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II. She was laid down on 5 October 1940 by Howaldtswerke, Hamburg as yard number 806, launched on 12 August 1941 and commissioned on 8 October 1941 under "Oberleutnant zur See" Hans-Jürgen