Created a vertical manual airlock and the rovers try to go down there without luck until they run out of batteries. Since there are stairs above and below the airlock, they think they can go there but obviously can't.
Second the suggestion of either auto destruct or recharge station for these bots. Now I have a nice "rover graveyard" above this door.
Create a vertical manual door. Create tasks under the door. Watch the rovers try their very, very best to get there.