international community." Another Number Two implies that both East and West are covertly operating the Village together for unknown reasons. The overall impression given by the series is that some kind of nebulous organisation is manipulating all the Cold War powers for its own ends. Security Weapons, alcohol, and tools are forbidden in the Village, but there are no walls or visible barriers to prevent escape, and no apparent prison guards. Indeed, aside from Number Two functioning as warden, the Village at first appears to have no real security infrastructure. This is merely a ruse, however, as subsequent episodes reveal that many of the other people in the Village are, in fact, warders planted unobtrusively in the community and reporting back to the current Number Two. It is strongly implied that "They" (the never-revealed masters of the Village) have several plants in the Village as well, whose identities are unknown to Number Two, and who report back to "Them" directly; one of the more sadistic Number Twos (seen in "Hammer into Anvil") is particularly paranoid about this possibility. An underground control room monitors closed-circuit television cameras located throughout the Village. Observers continually spy on Villagers and foil escape attempts with the aid of Rover, a large white balloon-like device that chases would-be escapees. The perimeter of the Village is surrounded by a pleasant wooded area, including one or two caves (which may or may not connect to the network of tunnels). Beyond this, Rover patrols: if anyone ventures too far from town, they will be intercepted and nudged back towards the Village. If anyone attempts to escape, Rover will capture them and they wake up in the Village hospital. Rover has also been shown to kill on two occasions; the exact cause of death is not revealed (the target is "enveloped"/suffocated; this happens to the victims in "Arrival" and "The Schizoid Man"), however, in "Free for All", Number Six is attacked in a similar manner, but survives. Customs Citizens use the phrase "Be seeing you" as a farewell, accompanied by a waving gesture consisting of thumb and forefinger forming a circle over the eye, then tipped forward in a salute. This may be a reminder that in the Village, one is under constant surveillance; anyone may be a warder, a stooge working for Number Two – although a simpler theory of the salute could be that the fingers are formed