I also squeezed in three Wilke Class subs which I think were used for mine-laying amongst other duties.
Between them the Polish subs seem to have had mixed fortunes, one at least sadly lost to a British minefield laid on its route after it had left port. Sounds like one hand didn't know what the other was doing! Even this sad event can be replicated in the rules I use as patches of 'difficult' and often dangerous terrain can be discovered and stumbled into. Some Jasolka class minelayers are next up, so thanks for looking. ;)