The Revelation Space Collection (455 page)

The descent to Mars was hard and steep.

Once or twice they were queried by the automated tracking systems of the Satellite Interdiction Network. Dark weapons hovering in Mars-synchronous orbit above the nest locked on to the ship for a few instants, magnetic railguns powering up, before the shuttle’s diplomatic nature was established and it was allowed to proceed. The Interdiction was very efficient; as well it might be, given that Clavain had designed much of it himself. In fifteen years no ship had entered or left the Martian atmosphere, nor had any surface vehicle ever escaped from Galiana’s nest.

‘There she is,’ Clavain said, as the Great Wall rose over the horizon.

‘Why do you call “it” a “she”?’ Voi asked. ‘I never felt the urge to personalise it, and I designed it. Besides . . . even if it was alive once, it’s dead now.’

She was right, but the Wall was still awesome to behold. Seen from orbit, it was a pale, circular ring on the surface of Mars, two thousand kilometres wide. Like a coral atoll, it entrapped its own weather system: a disc of bluer air flecked with creamy white clouds that stopped abruptly at the boundary.

Once, hundreds of communities had sheltered inside that cell of warm, thick, oxygen-rich atmosphere. The Wall was the most audacious and visible of Voi’s projects. The logic had been inescapable: a means to avoid the millennia-long timescales needed to terraform Mars via such conventional schemes as cometary bombardment or ice-cap thawing. Instead of modifying the whole atmosphere at once, the Wall allowed the initial effort to be concentrated in a relatively small region, at first only a thousand kilometres across. There were no craters deep enough, so the Wall had been completely artificial: a vast ring-shaped atmospheric dam designed to move slowly outward, encompassing ever more surface area at a rate of twenty kilometres per year. The Wall needed to be very tall because the low Martian gravity meant that the column of atmosphere was higher for a fixed surface pressure than on Earth. The ramparts were hundreds of metres thick, dark as glacial ice, sinking great taproots deep into the lithosphere to harvest the ores needed for the Wall’s continual growth. Yet two hundred kilometres higher, the wall was a diaphanously thin membrane only microns wide, completely invisible except when rare optical effects made it hang like a frozen aurora against the stars. Eco-engineers had seeded the liveable area circumscribed by the Wall with terran genestocks, deftly altered in orbital labs. Flora and fauna had moved out in vivacious waves, lapping eagerly against the constraints of the Wall.

But the Wall was dead.

It had stopped growing during the war, hit by some sort of viral weapon that crippled its replicating subsystems, and now even the ecosystem within it was failing; the atmosphere cooling, oxygen bleeding into space, pressure declining inevitably towards the Martian norm of one seven-thousandth of an atmosphere.

He wondered how it must look to Voi; whether in any sense she saw it as her murdered child.

‘I’m sorry we had to kill it,’ Clavain said. He was about to add that it had been the kind of act that war normalised, but decided the statement would have sounded hopelessly defensive.

‘You needn’t apologise,’ Voi said. ‘It was only machinery. I’m surprised it’s lasted as long as it has, frankly. There must still be some residual damage-repair capability. We Demarchists build for posterity, you know.’

Yes, and it worried Clavain’s own side. There was talk of challenging the Demarchist supremacy in the outer solar system; perhaps even an attempt to gain a Coalition foothold around Jupiter.

They skimmed the top of the Wall and punched through the thickening layers of atmosphere within it, the shuttle’s hull morphing to an arrowhead shape. The ground had an arid, bleached look to it, dotted here and there with ruined shacks, broken domes, gutted vehicles and shot-down shuttles. There were patches of shallow-rooted, mainly dark-red tundra vegetation: cotton grass, saxifrage, arctic poppies and lichen. Clavain knew each species by its distinct infrared signature, but many of the plants were in recession now that the imported bird species had died. Ice lay in great silver swathes, and what few expanses of open water remained were warmed by buried thermopiles. Elsewhere, whole zones had reverted to almost sterile permafrost. It could have been a kind of paradise, Clavain thought, had the war not ruined everything. Yet what had happened here could only be a foretaste of the devastation that would follow across the system, on Earth as well as Mars, if another war was allowed to happen.

‘Do you see the nest yet?’ Voi said.

‘Wait a second,’ Clavain said, requesting a head-up display that boxed the nest. ‘That’s it. A nice fat thermal signature, too. Nothing else for kilometres around - nothing inhabited, anyway.’

‘Yes. I see it now.’

The Conjoiner nest lay a third of the way from the Wall’s edge, not far from the footslopes of Arsia Mons. The entire encampment was only a kilometre across, circled by a dyke piled high with regolith dust on one side. The area within the Great Wall was large enough to have an appreciable weather system: spanning enough Martian latitude for significant Coriolis effects; enough longitude for diurnal warming and cooling to cause thermal currents.

He could see the nest much more clearly now, details leaping out of the haze.

Its external layout was crushingly familiar. Clavain’s side had been studying the nest from the vantage point of Deimos ever since the ceasefire. Phobos, with its lower orbit, would have been even better, of course - but there was no helping that, and perhaps the Phobos problem might actually prove useful in his negotiations with Galiana. She was somewhere in the nest, he knew: somewhere beneath the twenty varyingly sized domes emplaced within the rim, linked together by pressurised tunnels or merged at their boundaries like soap bubbles. The nest extended several tens of levels beneath the Martian surface; maybe deeper.

‘How many people do you think are inside?’ Voi said.

‘Nine hundred or so,’ said Clavain. ‘That’s an estimate based on my experiences as a prisoner, and the hundred or so who’ve died trying to escape since. The rest, I have to say, is pretty much guesswork.’

‘Our estimates aren’t dissimilar. A thousand or less here, and perhaps another three or four spread across the system in smaller nests. I know your side thinks we have better intelligence than that, but it happens not to be the case.’

‘Actually, I believe you.’ The shuttle’s airframe was flexing around them, morphing to a low-altitude profile with wide, bat-like wings. ‘I was just hoping you might have some clue as to why Galiana keeps wasting valuable lives on pointless escape attempts.’

Voi shrugged. ‘Maybe to her the lives aren’t anywhere near as valuable as you’d like to think.’

‘Do you honestly believe that?’

‘I’m not sure we can even begin to guess the thinking of a true hive-mind society, Clavain. Even from a Demarchist standpoint.’

There was a chirp from the console: Galiana signalling them. Clavain opened the channel allocated for Coalition-Conjoiner diplomacy.

‘Nevil Clavain?’ he heard.

‘Yes.’ He tried to sound as calm as possible. ‘I’m with Sandra Voi. We’re ready to land as soon as you show us where.’

‘Okay,’ Galiana said. ‘Vector your ship towards the westerly rim wall. And please, be careful.’

‘Thank you. Any particular reason for the caution?’

‘Just be quick about it, Nevil.’

They banked over the nest, shedding height until they were skimming only a few tens of metres above the weatherworn Martian surface. A wide rectangular door had opened in the concrete dyke revealing a hangar bay aglow with yellow lights.

‘That must be where Galiana launches her shuttles from,’ Clavain whispered. ‘We always thought there had to be some kind of opening on the western side of the rim, but we never had a good view of it before.’

‘Which still doesn’t tell us why she does it,’ Voi said.

The console chirped again - the link poor, even though they were so close. ‘Nose up,’ Galiana said. ‘You’re too low and slow. Get some altitude or the worms will lock on to you.’

‘You’re telling me there are worms here?’ Clavain said.

‘I thought you were the worm expert, Nevil.’

He nosed the shuttle up, but fractionally too late. Ahead of them something coiled out of the ground with lightning speed, metallic jaws opening in its blunt, armoured head. He recognised the type immediately: Ouroborus class. Worms of this form still infested a hundred niches across the system. Not quite as smart as the type infesting Phobos, but still adequately dangerous.

‘Shit,’ Voi said, her veneer of Demarchist cool cracking for an instant.

‘You said it,’ Clavain answered.

The Ouroborus passed underneath them and then there was a spine-jarring series of bumps as the jaws tore into the shuttle’s belly. Clavain felt the shuttle lurch down sickeningly; no longer a flying thing but an exercise in ballistics. The cool, minimalist, turquoise interior shifted liquidly into an emergency configuration, damage read-outs competing for attention with weapons-status options. Their seats ballooned around them.

‘Hold on,’ he said. ‘We’re going down.’

Voi’s calm returned. ‘Do you think we can reach the rim in time?’

‘Not a cat in hell’s chance.’ He wrestled with the controls all the same, but it was no good. The ground was coming up fast and hard. ‘I wish Galiana had warned us a bit sooner—’

‘I think she thought we already knew.’

They hit. The impact was harder than Clavain had been expecting, but the shuttle stayed in one piece and the seat cushioned him from the worst of it. They skidded for a few metres and then nosed up against a sandbank. Through the window Clavain saw the white worm racing towards them with undulating waves of its segmented robot body.

‘I think we’re finished,’ Voi said.

‘Not quite,’ Clavain said. ‘You’re not going to like this, but . . .’ Biting his tongue, he brought the shuttle’s hidden weapons online. An aiming scope plunged down from the ceiling; he brought his eyes to it and locked crosshairs onto the Ouroborus. Just like old times . . .

‘Damn you,’ Voi said. ‘This was meant to be an unarmed mission!’

‘You’re welcome to lodge a formal complaint.’

Clavain fired, the hull shaking from the recoil. Through the side window they watched the white worm blow apart into stubby segments. The parts wriggled beneath the dust.

‘Good shooting,’ Voi said, almost grudgingly. ‘Is it dead?’

‘For now,’ Clavain said. ‘It’ll take several hours for the segments to fuse back into a functional worm.’

‘Good,’ Voi said, pushing herself out of her seat. ‘But there will be a formal complaint, take my word.’

‘Maybe you’d rather the worm had eaten us?’

‘I just hate duplicity, Clavain.’

He tried the radio again. ‘Galiana? We’re down - the ship’s history, but we’re both unharmed.’

‘Thank God.’ Old verbal mannerisms died hard, even amongst the Conjoined. ‘But you can’t stay where you are. There are more worms in the area. Do you think you can make it overland to the nest?’

‘It’s only two hundred metres,’ Voi said. ‘It shouldn’t be a problem.’

Two hundred metres, yes, Clavain thought - but two hundred metres across treacherous, potholed ground riddled with enough soft depressions to hide a dozen worms. And then they would have to climb up the rim’s side to reach the entrance to the hangar bay - ten or fifteen metres above the soil, at least.

‘Let’s hope it isn’t,’ Clavain said.

He unbuckled, feeling light-headed as he stood for the first time in Martian gravity. He had adapted entirely too well to the one gee of the Deimos ring, constructed for the comfort of Earth-side tacticians. He went to the emergency locker and found a mask, which slithered eagerly across his face; another for Voi. They plugged in air-tanks and went to the shuttle’s door. This time, when it sphinctered open there was a glistening membrane stretched across the doorway, a recently licensed item of Demarchist technology. Clavain pushed through the membrane and the stuff enveloped him with a wet, sucking sound. By the time he hit the dirt, the membrane had hardened itself around his soles and had begun to contour around his body, forming ribs and accordioned joints while remaining transparent.

Voi exited behind him, gaining her own m-suit.

They loped away from the crashed shuttle, towards the dyke. The worms would be locking on to their seismic patterns already, if there were any nearby. They might be more interested in the shuttle for now, but they couldn’t count on it. Clavain knew the behaviour of worms intimately, knew the major routines that drove them; but that expertise did not guarantee his survival. It had almost failed him in Phobos.

The mask felt clammy against his face. The air at the base of the Great Wall was technically breathable, even now, but there was no point in taking chances when speed was of the essence. His feet scuffed through the topsoil, and while he felt as if he was crossing ground, the dyke obstinately refused to come any closer. It was larger than it had looked from the crash site; the distance further.

‘Another worm,’ Voi said.

White coils erupted through sand to the west. The Ouroborus was making undulating progress towards them, zigzagging with predatory calm, knowing that it could afford to take its time. In the tunnels of Phobos, they had never had the luxury of knowing when a worm was close. They struck from ambush, quick as pythons.