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Translation of document C-5
FLAG OFFICER SUBMARINES OPERATIONS DIVISION B. Nr. MOST SECRET SO ONLY MOST SECRET To: Supreme Command of the Navy-Naval War Staff / 1st Div. No written reference Subject: Base in Norway I. Suppositions: a. A position outside the Shetlands-Norway Straits b. Freedom from ice c. Rail communications These suppositions apply only to Trondheim and Narvik. II. Advantages and Disadvantages: 1. Trondheim: Advantages: a. Position within the fiord which is unaffected by artillery action from the sea. b. Deep water in the entry channels — difficult for the enemy to mine in their mining operations. c. Existence of several entry and exit routes. d. Protected areas directly in front of the harbor for exercises and entry. e. Southern position: i.e. short lines of communications to Germany, better climatic conditions, shorter route to the Atlantic. f. Basins which, according to the North Sea Handbook and instructions of the Navy Office at Hamburg, are suitable for U-boats. g. Several industrial installations which facilitate the constructions of repair — and supply installations. Disadvantages: Short distance from the bases of the British Air Force -- danger of air attack. 2. Narvik: Advantages: a,b,c,d, the same conditions as Trondheim e. Greater distance from the British bases — less danger of air attack. Disadvantages: a. Northern position: Long lines of communication to Germany, unfavorable climatic conditions, longer routes to the Atlantic. [Page 816] b. Communications only with the Baltic — The Gulf of Bothnia is not free from ice. c. No basins, quay-installations only in the bay. d. Very few industrial installations. Trondheim is therefore the more favorable place. III. The following is therefore proposed: 1. Establishment of a base in Trondheim, including: a. Possibility of supplying fuel, compressed air, oxygen, provisions. b. Repair opportunities for overhaul work after an encounter. c. Good opportunities for accommodating U-boat crews. d. Flak protection, L.A. armament, petrol and M/S units. 2. Establishment of the possibility of supplying fuel in Narvik as an alternative. Sgd. Doenitz.