LUGANO, TICINO. The dominant local primate of this canton once built sealed chambers beneath its dwellings against the arrival of nuclear war. It built them because the law said so, then sealed the hatch and forgot the law existed. As of this season, apartments containing such chambers sell at roughly 4 percent above asking, while identical units without one linger. The room designed to receive the end of the world now opens the sale.

Our observation began at minute three of a scheduled viewing, when a couple descended eight steps into a concrete chamber rated for twelve occupants. The apartment above sleeps four. By minute eleven the couple had produced two apologies, both directed at the realtor, neither occasioned by any harm. At minute fourteen the woman cranked the ventilation handle once, said nothing, and turned to her partner in a manner the chamber's original engineers did not plan for. On the wall hangs a laminated certificate rating the shelter for twelve persons, last countersigned in 1987, and she photographed it the way other primates photograph newborns. Nineteen images of the hatch now exist. Zero of the bedroom. By the viewing's conclusion the apology count stood at five, a figure our instruments had never before recorded for a transaction involving no harm.

The mechanism is short. Federal regulation required every building to include a shelter, producing a dense supply that residents used to store skis and items of planned aesthetic obsolescence. Demand slept for a generation. Recent geopolitical activity, which the species conducts periodically and calls exceptional each time, woke it. Buyers now ask whether the shelter is original. Sandro, a patient man, confirmed the preference: "Original is better. Like the beams."

"We wanted outdoor space," Marta told us, standing inside a windowless vault rated for radiation, fire, and the collapse of public order. "Instead we got security. Honestly, it feels safer." Behind her, three further buyers hold places on a waiting list, which appears to be a queue for the queue. None of the five apologised for this.

On our worlds, a counted population is a managed population; here the counting continues and manages nothing. The species has done the remarkable thing: it kept the shelter, kept the fear, and added 4 percent. The apocalypse arrives on schedule. It comes with a key handover.