Unknown submarine sighted 100 miles southeast of Curacao according to the U.S. Joint Intelligence Committee. Daily summary dated 21 December 1941

An item referred to OPNAV reporting that around noon 19 December an aircraft sighted an unknown submarine 100 miles southeast of Curacao, Netherlands Antilles.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 11 dated 21 December 1941.