Moin,
I played a mission with the FFG called "Al Faw Ambush". I had to escort a freighter through a minefield. There were floating mines which could be destroyed with the machine gun - although this is really difficult and somehow a bit ridiculous.
But I do not have a clue how to destroy moored mines on the seafloor.
With a torpedo? I could not classify the mines as a target to fire something on them. I had them on my passive hull sonar display and I could mark them. On the map display the showed up as a white cross with a tag but I could not engage them.
Any clues?