Gracias especialmente to Hitman & Klaus D,
One of the best books I found related to this subject is Heinz Hohne's 703 p. biography of Admiral Wilhelm Canaris. It is packed with details about Canaris' deep involvement in German-Spanish relations going back to WWI, when he worked in both naval intelligence and the U-boat service. The book may be out of print, but good libraries will have it.
Mach's gut!
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Dietrich Schöneboom, U-431
"Es wird klappen, Herr Kaleun. Ganz sicher."
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