Large number of enemy submarines in the East Pacific present according to the U.S. Joint Intelligence Committee. Daily summary dated 2 January 1942

An item reported the presence of 14 enemy submarines in the East Pacific including the Hawaiian area with changing positions moved to equal distances between Hawaii and the west coast.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 23 dated 2 January 1942