At least he knew which one he was looking for. I remember a show about a sub that had been found off the coast of New Jersey that they couldn’t identify for some time. In the meantime, they referred to it as “U-?” or “U-Who?”
It ended up being the U-869 which had been thought lost off Africa.
http://en.wikipedia.org/wiki/German_submarine_U-869
(’: One little mistake... ;’)
You mean the U-boats that practiced unrestricted warfare along the US coast during WW2 that the press didn’t report on so as to protect FDR?