Cut off by the water from any other sounds, the noise of. the air pump and the relayed rhythms of his own respiration drummed steadily in his ears, increasing in volume as the air pressure was raised. The sounds seemed to boom around him in the dark olivegreen water, thudding like the immense tidal pulse he had heard in his dreams.
A voice grated from his headphones. "Strangman here, Kerans. How's the grey sweet mother of us all?"
"Feels like home. I've nearly reached the bottom now. The diving cage is over by the entrance."
He sank to his knees in the soft loam which covered the floor, and steadied himself against a barnacled lamp post. In a relaxed, graceful moon-stride he loped slowly through the deep sludge, which rose from his footprints like clouds of disturbed gas. On his right were the dim flanks of the buildings lining the side-walk, the silt piled in soft dunes up to their first-floor windows. In the intervals between the buildings the slopes were almost twenty feet high, and the retaining grilles were locked into them like huge portcullises. Most of the windows were choked with debris, fragments of furniture and metal cabinets, sections of full boards, matted together by the fucus and cephalopods.
The diving cage swung slowly on its cable five feet off the street, a selection of hacksaws and spanners loosely tied to the floor. Kerans approached the doorway of the planetarium, steering the lines behind him and occasionally pulled lightly off his feet when they became over-extended.
Like an immense submarine temple, the white bulk of the planetarium stood before him, illuminated by the vivid surface water. The steel barricades around the entrance had been dismantled by the previous divers, and the semi-circular arc of doors which led into the foyer was open. Kerans switched on his helmet lamp and walked through the entrance. He peered carefully among the pillars and alcoves, following the steps which led up into the mezzanine. The metal railings and chromium display panels had rusted, but the whole interior of the planetarium, sealed off by the barricades from the plant and animal life of the lagoons, seemed completely untouched, as clean and untarnished as on the day the last dykes had collapsed.
Passing the ticket booth, he propelled himself slowly along the mezzanine, and paused by the rail to read the signs over the cloakroom doors, their luminous letters reflecting the light. A circular corridor led around the auditorium, the lamp throwing a pale cone of light down the solid black water. In the faint hope that the dykes would be repaired, the management of the planetarium had sealed a second inner ring of barricades around the auditorium, locked into place by padlocked cross-bars which had now rusted into immovable bulkheads.
The top right-hand corner panel of the second bulkhead had been jemmied back to provide a small peephole into the auditorium. Too tired by the water pressing on his chest and abdomen to lift the heavy suit, Kerans contented himself with a glimpse of a few motes of light gleaming through the cracks in the dome.
On his way to fetch a hacksaw from the diving cage, he noticed a small doorway at the top of a short flight of steps behind the ticket box, apparently leading over the auditorium, either a cineprojectionist's booth or the manager's office. He pulled himself up the handrail, the metal cleats of his weighted boots skating on the slimy carpet. The door was locked, but he drove his shoulders against it and the two hinges parted easily, the door gliding away gracefully across the floor like a paper sail.
Pausing to free his lines, Kerans listened to the steady pumping in his ears. The rhythm had changed perceptibly, indicating that a different pair of operators had taken over the job. They worked more slowly, presumably unaccustomed to pumping air at the maximum pressure. For some reason, Kerans felt a slight stirring of alarm. Although fully aware of Strangman's malice and unpredictability, he felt confident that he would not try to kill him by so crude a method as blocking the air supply. Both Beatrice and Bodkin were present, and although Riggs and his men were a thousand miles away there was always the chance that some specialist government unit might pay a flying visit to the lagoons. Unless he killed Beatrice and Bodkin as well-which seemed unlikely, for a number of reasons (he obviously suspected them of knowing more about the city than they admitted)-Strangman would find Kerans' death more trouble than it was worth.
As the air hissed reassuringly through his helmet, Kerans moved forward across the empty room. A few shelves sagged from one wall, a filing cabinet loomed in a corner. Suddenly, with a shock of alarm, he saw what appeared to be a man in an immense ballooning spacesuit facing him ten feet away, white bubbles streaming from his frog-like head, hands raised in an attitude of menace, a blaze of light pouring from his helmet.
"Strangman!" he shouted at it involuntarily.
"Kerans! What is it?" Strangman's voice, closer than the whisper of his own consciousness, cut across his panic. "Kerans, you fool…!"
"Sorry, Strangman." Kerans pulled himself together, and advanced slowly towards the approaching figure. "I've just seen myself in a mirror. I'm up in the manager's office or control room, I'm not sure which. There's a private stairway from the mezzanine, may be an entrance into the auditorium."
"Good man. See if you can find the safe. It should be behind the picture frame directly over the desk."
Ignoring him, Kerans placed his hands on the glass surface and swung the helmet sharply from left to right. He was in the control booth overlooking the auditorium, his image reflected in the glass sound-proof panel. In front of him was the cabinet which had once! held the instrument console, but the unit had been removed, and the producer's swing-back seat faced out unobstructed like an insulated throne of some germ-obsessed potentate. Almost exhausted by the pressure of the water, Kerans sat down in the seat and looked out over the circular auditorium.
Dimly illuminated by the small helmet lamp, the dark vault with its blurred walls cloaked with silt rose up above him like a huge velvet-upholstered womb in a surrealist nightmare. The black opaque water seemed to hang in solid vertical curtains, screening the dais in the centre of the auditorium as if hiding the ultimate sanctum of its depths. For some reason the womb-like image of the chamber was reinforced rather than diminished by the circular rows of seats, and Kerans heard the thudding in his ears uncertain whether he was listening to the dim subliminal requiem of his dreams. He opened the small panel door which led down into the auditorium, disconnecting the telephone cable from his helmet so that he would be free of Strangman's voice.
A light coating of silt covered the carpeted steps of the aisle. In the centre of the dome the water was at least twenty degrees warmer than it had been in the control room, heated by some freak of convection, and it bathed his skin like hot balm. The projector had been removed from the dais, but the cracks in the dome sparkled with distant points of light, like the galactic profiles of some distant universe. He gazed up at this unfamiliar zodiac, watching it emerge before his eyes like the first vision of some pelagic Cortez emerging from the oceanic deeps to glimpse the immense Pacifics of the open sky.
Standing on the dais, he looked around at the blank rows of seats facing him, wondering what uterine rite to perform for the invisible audience that seemed to watch him. The air pressure inside his helmet had increased sharply, as the men on the deck lost contact with him by telephone. The valves boomed off the sides of the helmet, the silver bubbles darted and swerved away from him like frantic phantoms.
Gradually, as the minutes passed, the preservation of this distant zodiac, perhaps the very configuration of constellations that had encompassed the Earth during the Triassic Period, seemed to Kerans a task more important than any other facing him. He stepped down from the dais and began to return to the control room, dragging the air-line after him. As he reached the panel door he felt the line snake Out through his hands, and with an impulse of anger seized a loop and anchored it around the handle of the door. He waited until the line tautened, then wound a second loop around the handle, providing himself with a radius of a dozen feet. He walked back down the steps and stopped half-way down the aisle, head held back, determined to engrave the image of the constellations on his retina. Already their patterns seemed more familiar than those of the classical constellations. In a vast, convulsive recession of the equinoxes, a billion sidereal days had reborn themselves, re-aligned the nebulae and island universes in their original perspectives.