The Revelation Space Collection (84 page)

She had barely finished speaking when the engines came online, howling to readiness, and the previously indeterminately defined walls and floors and ceilings suddenly assumed very concrete reality.

When the shaft vanished and they were dropping through emptiness, the sense of vertical speed suddenly ceasing was so great that Sylveste felt his body tense in expectation of imaginary stress. But it was illusion: they were still falling, faster now than ever, but the points of reference were so much more distant that there was little impression of motion.

He was inside Cerberus.

‘Well,’ Calvin said, speaking for what seemed like the first time in days, ‘is this all you expected?’

‘This is nothing,’ Sylveste said. ‘Just a prelude.’

But it was still the strangest artificial structure he had ever seen; the oddest place in which he had ever been confined. The crust curved over him: a world-englobing roof pierced by the narrow end of the bridgehead. The place was aglow with its own wan luminescence, seemingly generated by the immense snakes which lay in coiled complexity across what he now thought of as the floor. The huge tree-trunk buttresses reached all the way to the ceiling, gnarled and organic. Now that the view was an improvement on that gained from the robotic probes, he could see that the buttresses looked more as if they had grown out of the ceiling into the floor than the other way around. Their roots blended into the floor. The firmament looked less alive; more crystalline. In a flash of insight he saw that the floor was older than the ceiling; that the ceiling had been constructed around the world after the floor was already finished. It was almost as if they stemmed from different phases of Amarantin science.

‘Check your fall,’ Sajaki said. ‘We don’t want to hit the floor too quickly. Nor do we want to stray into some defence system which the bridgehead hasn’t neutralised.’

‘You think there might still be hostile elements?’

‘Perhaps not on this level,’ the Triumvir said. ‘But lower - I believe we can count on it. Such defences may not however have seen much use in the last million years, so they may be rather . . .’ He seemed to have to search for the word. ‘Rusty.’

‘On the other hand, maybe we shouldn’t count on that either.’

‘No, perhaps not.’

Suit thrust increased, and with it the feeling of gravity. Only a quarter of a gee, yet the vaulted ceiling was still an artefact of terrifying size. There was a kilometre of it between him and open space; a kilometre he would have to get through again if he ever wanted to leave. Of course, there were another thousand kilometres of planet below his feet, but he had no idea how far into those depths he would have to tunnel before he found what he was looking for. He hoped it would not be far: the nominal five days he had allotted himself for the journey and return now seemed to be cutting it dangerously close to the mark. Seen from outside, it was easy to accept Volyova’s equations of gain and loss and believe that they had some connection to reality. Here, when the forces represented by her equations had crystallised into vast and threatening structures, he had much less confidence in their predictive power.

‘You’re shit-scared, aren’t you?’ Calvin said.

‘You can read my emotions now, is that it?’

‘No. It’s just that your emotions ought to mirror mine. We think very similarly, you and I. More so than ever now.’ Calvin paused. ‘And I don’t mind admitting - I’m very, very scared. Probably more scared than a piece of software has any right to feel. Isn’t that profound, Dan?’

‘Save your profundities for later - I’m sure you’ll get the opportunity.’

‘I imagine you feel insignificant,’ Sajaki said, almost as if he had been listening in on the conversation. ‘Well; you’re justified in feeling that way. You are insignificant. That’s the majesty of this place. Would you choose it any other way?’

The ground was rushing towards him, strewn with geometric rubble. The suit’s proximity alarm began to chime, indicating the nearness of the floor. Less than a kilometre now, though it looked close enough to touch. He felt the suit begin to adjust itself around him, remoulding itself for surface operation. One hundred metres. They were descending towards a flattish crystal slab: presumably some chunk of the ceiling which had fallen all this way. It was the size of a small ballroom. He could see the blinding glare of his suit thrusters in its marbled surface.

‘Cut your thrust five seconds before impact,’ Sajaki said. ‘We don’t want the heat to trigger a defensive reaction.’

‘No,’ Sylveste said. ‘That’s the last thing we want.’

He assumed the suit would protect him from the fall, though it took an effort of will to follow Sajaki’s instructions, slipping into freefall five seconds before his feet were due to touch the crystal. The suit bulged slightly, projecting cushioning armour plates. The density of the gel-air rose and for a moment he almost blacked out. But when the impact came, it was almost too gentle to register.

He blinked, and realised he had fallen on his back. Great, he thought - very dignified. Then the suit righted itself and popped him back on his feet.

He was standing in Cerberus.

THIRTY-FIVE

Cerberus, Interior, 2567

‘How long now?’

‘We’ve been out a day.’ Sajaki’s voice sounded thin and distant, though his suit was only a few tens of metres away from Sylveste. ‘We still have plenty of time; don’t worry.’

‘I believe you,’ Sylveste said. ‘At least, part of me does. The other part isn’t so sure.’

‘That other part might be me,’ Calvin said quietly. ‘And no, I don’t believe we still have plenty of time. We might do, but I don’t think we should count on it. Not when we know so little.’

‘If that’s meant to inspire confidence . . .’

‘No, it wasn’t.’

‘Then shut up until you’ve got something constructive to say.’

They were kilometres into the second layer of Cerberus now; good progress by some yardsticks, since they had descended more vertical distance now than the tallest mountains on Earth - but it was still too slow. At this rate they would never make it back in time, if they even succeeded in reaching whatever destination they were striving towards. Before then, the bridgehead would surely have given in to the tireless expulsive energies being directed against it by the crustal defences, and it would be digested or spat away into space like an unwanted pip.

The second layer - the bedrock on which the snakes writhed, and into which the roof-supporting trees thrust their roots - had a crystalline topography, markedly different to the kind of quasi-organic look of the overlying structures. They had been forced to thread their way downwards in the narrow interstices between the densely packed crystal forms, like ants navigating between courses of brickwork. It was slow work, and it quickly depleted the suits’ reaction reservoirs, since all the downward movement had to be constantly checked by thrust. At first Sylveste had suggested that they use the monofilament grapples which the suits could deploy (or grow, or extrude; he did not bother himself with the details), but Sajaki had argued him out of it: it would have conserved reaction mass, but it would also have greatly delayed their descent, since hundreds of kilometres still lay below them. Apart from that, it would also have limited them to strictly vertical motion, which would have made them easy targets for hypothetical counterinsurgent systems. So they flew most of the time, stopping when necessary to ablate small quantities of Cerberus material. So far, Cerberus had not objected to their vampiric activities, and the crystals contained enough heavy trace-elements to feed the thruster reservoirs.

‘It’s as if it doesn’t know we’re here,’ Sylveste said.

Calvin answered him. ‘Maybe it doesn’t. Not much can have reached this far down in living memory. The systems designed to detect intruders and defend against them might have atrophied through disuse - assuming they ever existed in the first place.’

‘Why do I have the impression you’re suddenly trying to cheer me up?’

‘I suppose I have your best interests at heart.’ He imagined Calvin smiling, though there was no visual component to the simulation. ‘In any case, I believe what I just said. I think the deeper we go, the less likelihood we’ll have of being recognised as something unwanted. It’s like the human body - the greatest density of pain receptors lies in the skin.’

Sylveste remembered a stomach cramp he had once experienced through drinking too much cold water during a surface hike out from Chasm City, and wondered if there was even a glint of truth in what Calvin had just said to him. It was reassuring though; of that there was no doubt. But did it also mean that everything deeper would be half-sleeping; as if the mighty defences of the crust were now meaningless, because what lay below no longer worked as the Amarantin had intended? Was Cerberus a treasure chest which, though firmly locked and burnished to a high polish, contained nothing but rusting junk - if that?

There was no sense thinking that way. If any of this meant anything, if the last fifty years of his life (and perhaps even more than that) had been anything other than delusional obsession, there had to be something worth finding. The feeling was nothing he could articulate, but he was more sure of it than he had ever before been sure of anything.

Another day of descent passed; during intervals Sylveste slept, being awakened by his suit only when something notable occurred, or the external scene changed beyond some inbuilt tolerance and the suit decided that he had better be awake to witness it. If Sajaki slept Sylveste was unaware of it, but he ascribed this to the generally odd physiology of the man; his blood thickened by medichines, constantly cleansing; his Juggler-configured mind able to do without the auditing hours of normal sleep. When the going was easiest, they descended at a maximum rate of one kilometre a minute, which usually happened when some deep abyssal shaft hove into view. The return would be quicker, of course, since the suits would know the way they had come, barring changes in the structure of Cerberus itself. Now it was not uncommon for them to descend for several kilometres before hitting a dead end, or a shaft too narrow for safety, at which point they would retreat to the last branch point and attempt another route. It was pure trial and error, since the suit sensors could not see more than a few hundred metres ahead at any point, blocked by the massive solidity of the crystal elements. But, kilometre by kilometre, they made slow progress, bathed always in sickly turquoise-green light spilling from the crystals.

Gradually the character of the formations had been altering; there were shards here many kilometres across, impassive and immobile as glaciers. All the crystals were attached to one another, but the vaultlike spaces and vertiginous rifts between them gave the impression that they were floating freely, as if in mute denial of the world’s gravitational field. What were they, Sylveste wondered? Dead matter - literally, crystalline - or something stranger? Were they components; parts of some world-englobing mechanism which was too large to be glimpsed or even imagined? If they were machines, they must have been exploiting some hazy state of quantum reality, where concepts like heat and energy dissolved into uncertainty. Certainly, they were as cold as ice (the suit’s thermal sensors told him this), and yet beneath their translucent faces he sometimes sensed tremendous subliminal motion, like the ticking guts of a clock glimpsed through a veil of lucite. But when he asked the suit to investigate with its senses, the results it sent back were too ambiguous to be much help.

After forty hours of rambling descent they made a significant and helpful discovery. The crystal matrix thinned out in a transitional zone only a kilometre deep, exposing shafts wider and deeper than any they had yet encountered; more deliberate in design. They were two kilometres in width, and each of the ten shafts they examined fell towards convergent nothingness for two hundred vertical kilometres. The walls of the shafts emitted the same slightly nauseating green radiance as the crystal elements, and they shivered with the same underlying sense of pent-up motion, suggesting that they were parts of the same mechanisms, though fulfilling some very different function. Sylveste remembered what he knew about the great pyramids in Egypt; how they were riddled with shafts which had been dictated by the construction technique; escape routes for the workers who sealed the tombs within. Perhaps something similar applied here, or perhaps the shafts had once served to radiate the heat of engines now quietened.

Discovering them was a godsend, since it enormously quickened their rate of descent, but that gift was not without its hazards. Constrained by the linear walls of the shaft, there would be nowhere to seek refuge if an attack came, and only two possible directions of escape. Yet if they delayed further, they would face imprisonment in Cerberus when the bridgehead collapsed; no more palatable a fate. So they risked using the shafts.

They could not simply fall. That had been possible before, when the vertical distance was no more than a kilometre or so, but here the very size of the shafts brought unanticipated problems. They found themselves drifting mysteriously towards the walls, and had to keep applying bursts of corrective thrust to stop themselves being dashed against the rushing precipice of sickly jade. It was Coriolis force, of course: the same fictitious force which curved wind vectors into cyclones on the surface of a rotating planet. Here, Coriolis force objected to a strictly linear descent, since Cerberus was rotating, and Sylveste and Sajaki had to shed excess angular momentum with each movement closer to the core. Yet compared to their earlier slow progress, it was gratifyingly rapid.