Black Swan class. Keep running into them around the Eastern ports of Britain in my current campaign. Name sounds cool and since its early 1940 in the campaign it's a bit scarier then the average V&W.
Just got pinged by sonar for the first time by one in a Brit port. He was wounded in the front from a torp while coming straight at me. Shouldn't have been loading torpedos that close to a decent port.
He eventually went past me wounded as I crept along. I fired off an aft shot at 700m. Boom! He stopped and his nose plunged, evened out for a bit, then the tail raised and my crew shouted.
Was a good feeling. Then I sighted a Granville type freighter in front of me, lined up magnetic shots to go off at .5m under the boat and fired two torpedos. Both torpedos launched but the event cameras went away quick. Couldn't see trails in external.... Maybe I used electric was my first thought. I looked under water and my bow was probably two feet away from a GWX mine net.
I just backed it up slow and called it even. Long post but fellow mine haters might enjoy.