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
U-boat Campaign (World War I) operations. One of the ships sunk near the Norwegian coast was the Romanian merchant "Bistrița", sunk by "U-43" on 11 November. Before sinking the ship, the captain of the U-boat allowed the ship's crew to take refuge in his submarine, then later he handed over the crew to a Russian sailing ship which took them to Vardø. From there, they were eventually repatriated. The Constantinople Flotilla was established in May 1915 and operated U-boats in the Black Sea. Bulgaria joined the campaign in May 1916, when the German submarine "UB-8" was commissioned by the Bulgarian Navy as "Podvodnik". In three