U-46 may refer to one of the following German submarines:
Germany, officially the Federal Republic of Germany, is a country in Central and Western Europe, lying between the Baltic and North Seas to the north, and the Alps to the south. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, France to the southwest, and Luxembourg, Belgium and the Netherlands to the west.
- SM U-46, was a Type U 43 submarine launched in 1915 and that served in the First World War until surrendered to Japan on 26 November 1918; later served as Japanese submarine O-2, 1920–21; rebuilt for test purposes in 1925 but lost in storm; hulk scuttled after discovered by U.S. merchant ship in August 1927
- During the First World War, Germany also had these submarines with similar names:
- SM UB-46, a Type UB II submarine launched in 1916 and sunk on 7 December 1916
- SM UC-46, a Type UC II submarine launched in 1916 and sunk on 8 February 1917
The UB II type submarine was a class of U-boat built during World War I by the German Imperial Navy. They were enlarged from the preceding type UB I and were more effective vessels. The boats were a single hull design with a 50-metre maximum diving depth and a 30-45 second diving time. In 1915 and 1916, 30 were built at two different shipyards.
SM UC-46 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy during World War I. The U-boat was ordered on 20 November 1915, laid down on 1 February 1916, and was launched on 8 August 1916. She was commissioned into the German Imperial Navy on 15 September 1916 as SM UC-46. In four patrols UC-46 was credited with sinking 10 ships, either by torpedo or by mines laid. UC-46 was rammed and sunk southeast of Goodwin Sands by the British destroyer Liberty on 8 February 1917.
Type UC II minelaying submarines were used by the Imperial German Navy during World War I. They displaced 417 tons, carried guns, 7 torpedoes and up to 18 mines. The ships were double-hulled with improved range and seakeeping compared to the UC I type.
- During the First World War, Germany also had these submarines with similar names:
- German submarine U-46 (1938), a Type VIIB submarine that served in the Second World War until stricken on 14 October 1943; scuttled 4 May 1945
SM U-46 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-46 was engaged in the combat during World War I and took part in the First Battle of the Atlantic. After the war, she served in the Imperial Japanese Navy as O-2.
World War I, also known as the First World War or the Great War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. Contemporaneously described as "the war to end all wars", it led to the mobilisation of more than 70 million military personnel, including 60 million Europeans, making it one of the largest wars in history. It is also one of the deadliest conflicts in history, with an estimated nine million combatants and seven million civilian deaths as a direct result of the war, while resulting genocides and the 1918 influenza pandemic caused another 50 to 100 million deaths worldwide.
SM UB-46 was a Type UB II submarine or U-boat for the German Imperial Navy during World War I. UB-46 operated in the Mediterranean and the Black Seas, and was sunk by a mine in December 1916.
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