German submarines using Vigo, Spain as supply base according to the U.S. Joint Intelligence Committee. Daily summary dated 4 January 1942

An item reported that the British captured a German submarine which prove more or less that German submarines refuelled and revictualled at Vigo, Spain.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 25 dated 4 January 1942