I was on my 8th patrol, heading to a grid west of gibraltar. I was north of Stornoway, sea was heavy, wind about 15m/s and fog heavy, when my watch crew shout "Ship spotted" in German, I think they said Shieft gesichtsteed?
Anyway, I quickly went to Nav map and check to see if there's a ship nearby, at 90% realism I still use map contact update :p . The map didn't show anything, so I went to watch tower and look through the UZO. I scanned around and there it was, bearing 150 deg, an S class submarine.
They started to shooting ... I ordered my crew to man the flak gun to return fire... but they told me that they can't man the gun in this weather condition. So I ordered ahead flank and periscope depth. Meanwhile, my boat were taking damage ... nothing serious ... but still...
While my was diving I went to the periscope and prepared the stern tubes. I set stern torps at 2 m deep, impact pistol. I watch the s class in my persicope, it was only 200 m behind me. So I waited a while longer until the distance got to 300 m or more. when the distance was 310m, I fired my torp. But then since fog was heavy, the sub slowly disappeared into the fog. Affraid that the first torp dud and that I might lose the s class in the fog completely, I fired my second torp. Just a few second after the second torp left the tube, the first torp hit the target and sent it down ... poor b@$t@rd@
edit: I meant "Type S" submarine ... not mercedez "S class" ...