It seems like a lot of the muties in the waterway dungeon don't seem to react to gun or explosion sounds during combat, as they only get aggrod by line of sight even though I was fighting their allies just a few tiles over, with no locked doors inbetween. Specifically I mean the area where the player gets trapped and ambushed by mutie jetskis, but I entered through the hatch guarded with autocannons. Was also playing on dominating difficulty if that matters