Using traditional heuristics, policemen can spot any dead volcano -- as long as it never grows too big. This volcano in front of you, for instance, is annoyingly huge for the population. It was supposed to please and entertain them, but all of them dislike it instead. A total failure. In fact, the situation gets worse each time one of them wants to enter or leave their room, because it is hard to decide. You may ask : who erupts?