Our little tram sped along southward, wending its way over the terraces. Save for the guards and lookouts in their occasional cubbies, and the air-traffic directors in their towers, we were alone up here. The roof was tangled with air-pipes, line-wire conduits, aerials, arterial systems of the ventilating and lighting devices. As far as one could see the ventilators stood fronting the night breeze like listening ears. There were water tanks, great cross-bulkheads and flumes to handle the rain and snow. A few traffic towers maintained order in the overhead air-lanes. Their beacons shot up into the sky when the passing lights marked the thinly-strewn trinight traffic. We were stopped at intervals, but in each case were passed promptly. "Nothing yet, Gregg?" "No." Anita's channel remained empty. It was, I suppose, no more than ten minutes during which we sped south along the grotesque maze of the roof; but to us it was an eternity. If only some message would come! "I'll pull up here." "Yes." I gathered up my little audiphone, thrust it under my dark flowing cloak. If only our cloaks were magnetic! We leaped from our car. "In a rush, Haljan?" asked a guard. "That's us. Orders from Mr. Brayley." We left him and plunged into a descending automatic lift. A drop of a thousand feet; we shot downward past all the deserted levels, past the ground-level, the undersurface transportation lanes, the sub-river tubes, the sub-cellar, down to the very bottom of the city. "Come on, Gregg. Two segments from here." We advanced at a run. At this hour of night, hardly a pedestrian was in evidence. It was an arched vaulted corridor, almost a tunnel, dimly blue-lit with short lengths of fluorescent tubes at intervals on the ceiling. For all the vaunted mechanisms of our time, the air here was heavy and fetid. Moisture dripped from the concrete roof. It lay on the metal pavement of the ground; the smell of it was dank, tomb-like. There were frequent cross-tunnels. We turned eastward into one of them. For a segment there were the lower entrances to the cellars of the giant buildings overhead. We passed a place where the tunnel-corridor widened into a great underground plaza. The sewerage and wire-pipes lay like tangled pythons on its floor. Half across it, by the glow of temporary lights strung on a cable, a group of repairmen were working. We passed them, headed in to where the tunnel narrowed again and there were now occasional cubby entrances to underground dwellings. It was a rabbit warren from here to the river, haunted by criminals and by miserable families, many of whom never saw the daylight for weeks at a time. The giant voices of the city hardly carried down here, so that an oppressive silence hung upon everything. "That next crossing, Gregg. They said they'd wait for us there."