Aside from the creation of transportation bottlenecks, the Allied bombing of Germany had no effect on the production, research, development, or storage of Naval Mines. To safeguard production, the Germans dispersed their contracts among various factories and required that critical parts be manufactured by at least two separate firms. This arrange-ment provid entirely satisfactory, and no further precautions were taken. On the other hand, the research and development installation of SVK and E-Stelle, although particul-arly vulnerable to air attack, escaped damage throughout the war solely becasue the Allied Air Forces chose to neglect them. Similarly the mine depots, with the exception of the one at L'Isle Adam, France, escaped damage throughout the war. The escape of these latter activities was, at least in part, due to their location within heavily wooded areas and to their excellent camouflage, both of which combined to make detection from the air extremely difficult.