Here is what I'm trying to do;
My sea mines are "submarine"-class (makes sense), but what doesn't make sense is them evading attempts to neutralize them...

Mines are chained to the bottom of the sea, once you've found them they are sitting ducks, they can't evade you...
Obviously I need to keep them in the "submarine" class to prevent them from being visible from afar (else they are not dangerous, just annoying), but of course I can't remove evasion for the whole "submarine" class, my real submarines need to be able to evade if they are to survive more than a couple turns...