They emerged from the elevator shaft into a vast cylindrical warehouse lit with sullen yellow bulbs. It had two decks: a lower floor, beneath her bare feet, of solid iron, and an upper one of perforated grating. It was cavernous, two hundred feet long; every ten feet it was cut, left and right, by massive bulging elevator shafts. Shafts nine feet across, steel silos, their bases stuck with plugs and power cables. Like bio-tech tanks, she thought, big fermenters.