The first sub I lost was a VIIB. After installing the merchant fleet mod, I started a new career on 100% realism. I was in the channel when war was declared and made a spirited fighting withdrawral to the south west, sinking a few merchants and evading the many patrol craft and a couple of proper escorts.
Anyway, drawing about level with Land's End, I thought "phew, I made it!" when my lookout spots a lone freighter steaming for the channel. It's daylight and I'm still well within air cover so I decide to make a submerged attack. She shrugs off the one torpedo I sent her and continues with only a slight list to port.
Well, I'm not following her for hours back into the channel to see if she sinks, so I decide to surface, sink her quickly with the deck gun and continue to my patrol sector. Big mistake.
I surfaced at about 1000m and immediately I'm being fired upon. "But she's not even armed!" I cried and then it dawned on me... A Q-ship! Well, not wanting to chance a dive now that my boat's filling with water at a rate of knots, I manned the deck gun personally (I'm rather good with it if I do say so myself) and actually sunk her first. None of my crew were even injured but the boat was beat up pretty bad, I began repairs and sailed off to my patrol sector.
Days later, returning to Germany, I spotted an Anson off the north coast of Scotland and without thinking ordered a crash dive. The boat imploded at 55m.
Just my luck there was a Q-ship, already in service and out to sea before war was declared. What the hell?
