Stephen Baxter - Transcendent

All of this was utterly authentic, so she understood, though she knew nothing of the technology involved: this wasn’t a reconstruction, this really was the life of Michael Poole as he had lived it, five thousand centuries ago, all of it from birth to death embedded deep in the irrevocable past, and locked up inside her tank for her benefit.

Reath reminded her it was the obligation of every citizen to keep up her program of Witnessing, as ordained by mysterious bodies at the heart of the Commonwealth, which he called “the Colleges of Redemption.” So he allowed her to believe she wasn’t after all being helplessly sentimental in clinging to Michael Poole, her childhood companion; it was her duty. Perhaps he was sparing her feelings, and if so she was grateful for his indulgence. But he did take the Witnessing very seriously indeed, for he said the Redemption was at the heart of the greatest ambitions of the Transcendence.

And so, in the bowels of Reath’s severe ship, as the stars sailed by, she spent long hours immersed in the bright Florida light of Poole’s long-ago childhood. She wished she could be there now, gazing not on this dismal water-world but on the sparkling seas of Earth.

Hundreds of kilometers of featureless ocean passed under the flitter’s prow.

“Reath, what is this world called? ”

“Names are relative,” Reath said, smiling. “They depend on your viewpoint.”

Any world had a multiplicity of names, he said. The Commonwealth maintained formal catalogs, numbering every star and planet, comet and asteroid, every object of any significant size in the Galaxy. Some of these catalogs were based on antecedents that went back hundreds of millennia, to the days when the whole Galaxy had been an arena of war. There were other viewpoints, too. Those near enough to see this world’s star in their sky would give it a more formal name, as part of some constellation, say; they might even name the world itself if they could see it. Thus the world might have a dozen, a hundred such names, assigned from different interstellar viewpoints. But a world’s primal name (or names) was that given it by those who lived here.

Alia gazed down at the endless seascape. “So what do the locals call this world? Wet? ”

“You’ll see,” he said evasively.

“And why is there no land here?”

He smiled. “Because the ocean is too deep…”

There was no world quite like this one in Sol system. This world was bigger than Earth, six times as massive. It had first formed far from its sun, so far out that water and other volatiles had not been driven off by its sun’s heat as it coalesced. As it cooled it was left with a rocky core about the size of the Earth, but that inner core was swathed in a blanket of water ice.

After its formation was completed, this world had been gathered in as the moon of a gas giant. Thus things might have remained, if not for the fact that the parent Jovian, its orbit impeded by the remnant dust cloud from which it had formed, migrated steadily in toward its sun. And the ice moon began to melt.

“At last almost all the ice went — there’s just a couple of islands of it at the poles now — leaving an ocean more than a hundred kilometers thick, over a remnant ice mantle. That’s, oh, ten times as thick as the oceans on Earth. And then a little outgassing created the atmosphere. Weather started, and—”

“And that’s why there is no land?”

“How could there be dry land, Alia? Even if the seabed was rock, you’d need a mountain a hundred kilometers tall to poke above the ocean surface to make an island. No such mountains are possible on Earth, let alone here, where the gravity is about fifty percent above standard. And besides the seabed is ice, not rock.

“Because of the lack of land, it was difficult for life to get started here. There is life here, though: life that kick-started on other, more hospitable worlds of the system, and drifted here as spores—”

“Panspermia.”

“Yes.” He nodded approvingly. “And then, of course, people came.”

People? But, she wondered, how could they live here?

Reath pointed. “There it is at last. Our destination.”

Adrift in the middle of the endless ocean was a scrap of bright orange — a rectangle, a man-made thing. Alia felt unreasonable relief to see this bit of human engineering in the immense emptiness of the sea.

At first glance the platform seemed to be resting on a narrow stalk that protruded out of the ocean. But it turned out that the platform was studded with antigravity lifters, and the “stalk” was actually a cable anchored in the deep ice, under tension as the lifters endlessly tried to pull the platform into the sky. It struck Alia as a cheap and quick solution to the problem of stability on a watery world.

The flitter slowed, and dipped toward the platform. Alia felt reluctant to Skim; she hadn’t done so since leaving the Nord. So she and Reath climbed down out of the flitter the old-fashioned way, through a door.

The wind was strong and buffeting, and cold on her face, only a little above freezing. Reath seemed unperturbed, though he was so tall and skinny he looked as if he might blow away.

The air was mostly nitrogen and carbon dioxide — scarcely a trace of oxygen; life was rare here. But of course there was Mist in the air, the invisible population of nanomachines and engineered bugs that infested the atmosphere and oceans of every human planet. She stood still to let the Mist suffuse her. Her bones and muscles tingled as they were strengthened to cope with the heavy gravity, and the air she drew into her lungs fizzed with oxygenation. The cold was kept out of her body, but she could taste the salt-laden air in her mouth, the sharp, heavily salted tang of the global sea.

She made her way cautiously to the edge of the platform. There was no rail, no barrier between her and the abyssal ocean. Near the edge the wind grew stronger, and in the ocean below waves growled back and forth.

“I’m glad we’re out of reach of those waves,” Alia said.

“So we are — most of the time. Remember there’s no land here, Alia, nothing to make the waves break. A wave system can just keep on traveling, gathering up more and more energy—”

“Like the hurricanes.”

“But we should be safe from being washed away for today.”

Though the platform was high above the waves it rocked and tipped subtly, its anchoring cable creaking noisily. The motion was slight, but very unsettling.

“Don’t worry,” Reath shouted over the wind, “we’re quite safe. It’s just that there’s a cable a hundred kilometers long beneath us! No matter how strong the tension in it is, you’re going to get vibrations, resonances. The cable is a string plucked by the ocean! Why, if the worse came to the worst and the cable snapped altogether, the antigravity lifters would just take us flying up through the clouds into space.”

“I think I’d prefer it if it did snap,” she said. She looked around the platform. Aside from the sleek form of their flitter, glistening with spray, there was only a huddle of automated sensors. “Reath, why have we come here?”

“Why, for the people,” he said. “Because people are here, we must come here. The Commonwealth, I mean. That is the mandate of the Transcendence.”

“How will they even know we are here? We can’t integrate them if we can’t find them!”

He held a hand to one ear. “Can’t you hear?”

She frowned, concentrating, expanding her hearing range. She made out a deep thrumming, subsonic, far below the standard human range.

“It is a beacon,” he said. “Audible for hundreds of kilometers underwater.”

“They live underwater? ”