US Navy made two submarine contacts near Eureka and Pigeon Point according to the U.S. Joint Intelligence Committee. Daily summary dated 23 December 1941

An item referred to the Western Defende Command Press reporting that the US Navy made two submarine contacts, one near Eureka at 10.00 PST and the second one around 15 miles from Pigeon Point 12.30 PST. Further details were not supplied.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 13 dated 23 December 1941.