Hi CaptainD,
I found this on Wikipedia
Quote:
On 5 September 1939 U-38 stopped the French ship Pluvoise, examined her papers and released her. Pluvoise broadcast the event, which would warn others of the U-boat. Liebe was reprimanded.
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Apparently there was a French merchant ship using that name during WW2, or the German's misspelled it in their log book. The SSS signals are actual radio messages received and recorded during WW2.