The Type II U-boat was designed by Germany as a coastal U-boat, modeled after the CV-707 submarine, which was designed by the Dutch dummy company NV Ingenieurskantoor voor Scheepsbouw den Haag (I.v.S) (set up by Germany after World War I in order to maintain and develop German submarine technology and to circumvent the limitations set by the Treaty of Versailles) and built in 1933 by the Finnish Crichton-Vulcan shipyard in Turku, Finland.
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 federal parliamentary republic in western-central Europe.
New!!: German submarine U-138 and Germany ·
Laying the keel, or laying down is the formal recognition of the start of a ship's construction.
A submarine is a watercraft capable of independent operation underwater.
New!!: German submarine U-138 and Submarine ·
World War I (WWI or WW1), also known as the First World War or the Great War, was a global war centered in Europe that began on 28 July 1914 and lasted until 11 November 1918.
World War II (WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, though related conflicts began earlier.