
Mary mentioned the U505 in the comments yesterday. That was the sub that had the Enigma codes for WWII. Actually the whole Enigma Code thing is interesting as we had cracked Enigma way back in the late 1930s. But the Germans kept changing the way they used the codes.It was an excellent machine used stupidly. ANYWAY - the U505 was mentioned a lot in the book "Shadow Divers: The True Adventure of Two Americans Who Risked Everything to Solve One...