Type U 127 submarine was a class of U-boats built during World War I by the Kaiserliche Marine.
The Type UB III submarine was a class of U-boat built during World War I by the German Imperial Navy.
Germany (Deutschland), officially the Federal Republic of Germany (Bundesrepublik Deutschland), is a sovereign state in central-western Europe.
Laying the keel or laying down is the formal recognition of the start of a ship's construction.
A submarine (or simply sub) is a watercraft capable of independent operation underwater.
World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.