Some other suggestions:
1. It was a Bug
[i] That's allmost impossible to belive, because the game is original UBI production...
2. It was The Diving Trawler
My grandfather told me once how his father knew a man who knew a man who saw this ghostship somewhat 200 miles south off New Foundland 21. of April 1782... Can't believe on that either... What I saw was a steamer... Definetly.
3. It was... Kretschmer
I thought Otto was to be somewhere around Scotland to find out where the Home Fleet is anchored after Günther had some fun in Scapa... Now I'm pretty sure Silent Otto got something else in his mind and he sneaked to the coast of Norway, just to pick up the only merchant I was able to sunk while on this patrol...