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-972 "U-972", it is reported that she sank by one of her own circling T5 torpedoes. But now it is believed she was sunk by Allied Warships. This was her first and only patrol during World War II. The real reason of her sinking is still unknown as her last resting place remains lost. German submarine U-972 German submarine "U-972" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The "U-972" was laid down on 15 June, 1942 at the Blohm & Voss yard in Hamburg, Germany. She was launched on 22 February 1943 and commissioned on