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-250 German submarine U-250 German submarine "U-250" was a Type VIIC U-boat of Nazi Germany's navy ("Kriegsmarine") during World War II. The submarine was laid down on 9 January 1943 at the Friedrich Krupp Germaniawerft yard at Kiel as yard number 684. She was launched on 11 November 1943 and commissioned on 12 December under the command of "Kapitänleutnant" Werner-Karl Schmidt. In one patrol, she sank one ship. The boat was sunk by the Soviet submarine chaser "MO103" in the Gulf of Finland (Baltic) in July 1944. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-250" had