Enemy submarines sighted of Hawaii according to the U.S. Joint Intelligence Committee. Daily summary dated 15 December 1941

An item referred to CINCPAC reporting that aircraft sighted on 14 December off Hawaii 4 submarines. One Japanese minitiare submarine entered Pearl Harbor but was destroyed with depth charges.

Source

Map Room Papers (Roosevelt Administration) mr0422a. U.S. Joint Intelligence Committee. Daily summary No. 5 Dated 15 December 1941.