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-306 German submarine U-306 German submarine "U-306" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The submarine was laid down on 16 September 1941 at the "Flender Werke" yard at Lübeck as yard number 306, launched on 29 August 1942 and commissioned on 21 October under the command of "Oberleutnant" Claus von Trotha. During her career, the U-boat sailed on five combat patrols, sinking one ship and damaging two others, before she was sunk in October 1943 in mid-Atlantic, northwest of the Azores by British warships. She was a member of three wolfpacks. German Type VIIC