Allied supply lines between Dutch East Indies Australia&Indian Ocean threatened by Japanese submarines according to the U.S. Joint Intelligence Committee. Daily summary dated 19 February 1942

An item reported that an increase of Japanese submarine activities along the supply routes between Java, Dutch East Indies and Australia&Indian Ocean was to be expected.Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. MR0423. U.S. Joint Intelligence Committee. Daily summary No. 71 dated 19 February 1942