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-651 German submarine U-651 German submarine "U-651" was a German Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II. She was ordered just after the war started in 1939, laid down on 16 January 1940, launched in December that year and commissioned the following February. She was commanded by Kapitänleutnant Peter Lohmeyer. Her career was a short one. She took part in only one patrol and sank two ships in convoy Convoy HX 133: the merchantmen "Brockley Hill" and . She was sunk by the escort for the same convoy but 45 of her crew were