Japanese submarines transferred from Hawaiian area to southeast Asia according to the U.S. Joint Intelligence Committee. Daily summary dated 20 January 1942

An item reported that the activities of enemy submarines in the Eastern Pacific was on large scale reduced and many of the involved submarines from the Hawaiian area transferred to southeast Asia.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 41 dated 20 January 1942