Increasing number of enemy submarines active in the Atlantic Ocean according to the U.S. Joint Intelligence Committee. Daily summary dated 21 March 1942

An item referred to the Summary dated 20 March No. 100 reporting that in the Atlantic Ocean were another 9 enemy submarines active. Namely 1 northwest of the Azores moving to the west, one in the Azores area moving southwest and six or seven operating northeast of the Azores.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 101 dated 21 March 1942