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-287 before the remaining crew scuttled the ship near Schelenkuhlen in the Elbe river on 16 May. They testified that they were sunk by a mine, which was documented as the official reason of loss. German submarine U-287 German submarine "U-287" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The submarine was laid down on 8 August 1942 at the "Bremer Vulkan" yard at Bremen-Vegesack as yard number 52. She was launched on 13 August 1943 and commissioned on 22 September under the command of "Oberleutnant zur See" Heinrich Meyer. She did not sink or damage