I was on my third patrol October 1939 in the North Sea. I must admit the sea had turned a bit rough but in my opinion not so bad that it could sink a merchant. Even if the weather were responsible would you see lots of smoke as though the ship had blown up? I didn't actually see the ship sink, I was at the navigation station at the time and the contact icon just switched to the sunk ship icon and I went up to the bridge and saw lots of smoke on the horizon.
Nemo
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