Rokvam:
I did deviate to Scapa Flow on my 7 Oct 1939 patrol. Terrible weather and low overcast so few worries about air attacks - ran surfaced most of the way. Threaded through Prein's northern route into the Bay. Sonar sweep revealed a huge number of ships, either anchored solo or in the dock. But...but...too much rain and fog to identify any of the contacts. I mean I could identify none of them. Besides there were very, very active surface patrols. So I left and went to my assigned patrol area to the east, AM37.
Prein was either nuts or superhumanly brilliant or amazingly lucky, or all three. I vote for the latter.
Thought I'd report, Mein Herr.
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