Another Rizky Ferriansyah design - [http://myhobbycraft.blogspot.com/] , now he we wants to capture the massive German submarine pen on world war II era. A submarine pen is a bunker to protect submarines or U-boats from bombing. German World War II U-boat pens in France included Saint-Nazaire, Lorient, La Rochelle and Toulon. In Norway, DORA 1 was a large pen in Trondheim, Norway. U-boat pens protecting construction of the German Type XXI submarine were located at Hamburg (Blohm & Voss), Bremen (AG Weser), and Danzig (F. Schichau).