Historical:

Type VII U-boats were the workhorses of the German World War II U-boot-waffe. Type VII was based on earlier German submarine designs, designed through the Dutch dummy company Ingenieurskantoor voor Scheepsbouw den Haag (I.v.S) (set up by Germany after World War I in order to maintain and develop German submarine know-how and to circumvent the limitations set by the Treaty of Versailles) and built by shipyards around the world; the Finnish Vetehinen class and Spanish Type E-1. These designs led to the Type VII along with Type I, the latter being built in AG Weser shipyard in Bremen, Germany. The production of Type I was cut down only after two boats, the reasons for this are not certain and range from political decisions to faults of the type. The design of the Type I was however further used in the development of the Type VII and Type IX. Submarines of the Type VII were the most widely used boats of the war and were the most produced submarine class in history, with over 700 built. The type had several modifications.

Info: German Kriegsmarine Type VII U-Boat - 1941

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