Activities of enemy submarines on the Atlantic ocean unclear according to the U.S. Joint Intelligence Committee. Daily summary dated 31 December 1941

An item reported that the enemy submarine activities in the Atlantic theater lacked any evidence making it impossible to get a clear picture. Probably were the boats moving to new operating areas.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 21 dated 31 December 1942