“But Vox has enemies,” Turk pointed out, “who went to the trouble of bombing it.”

“They would have finished us by now, if they had anything left to throw.”

“So we’ll pass under the Arch, one way or another?”

“Two possible outcomes,” I told him. “If nothing happens we’ll be left adrift and defenseless on the Equatorian ocean. Probably invaded and occupied by the bionormatives, if they get their act together.”

“And if we do make it to Earth?”

“No way of knowing, but Earth was barely habitable when the Arch stopped working, and that was a thousand years ago, give or take. The oceans were going bad, huge bacterial blooms emitting massive amounts of hydrogen sulfide into the air. We have to assume an atmosphere poisonous enough to kill any unprotected living thing. Which is why it would be a very bad idea to be out of doors if we cross.”

“So where do we find protection?”

“The only real safe place is Vox Core. It can seal itself and recycle its air. That’s where the Farmers are heading. With the Network and other systems down, they can’t count on protection for the out-islands. They want to get inside the walls before the transit. But there isn’t room in Core for every outlier community in the Archipelago. The Farmers will have to fight their way in.”

4.

At the end of another day’s march the Farmer militia halted for the night. Digger Choi lowered the gate of the cart, pushed two bowls of green gruel inside, and untied our hands so we could eat. Turk stood up for the first time today, rubbing his wrists and legs. He balanced himself against the wall of the cart and turned his head to see where we were. That was when he got his first look at Vox Core.

The expression on his face was interesting—awe and fear, mixed together.

Vox Core was mostly underground, but the fraction of it that showed was impressive enough. The Farmers had camped in the lee of a low hill, and from this angle Vox Core looked like a jewelry box abandoned by a spendthrift god. Its half-mile-high defensive walls were the box; the jewels were the hundreds of faceted towers still standing: communications and energy-distribution points, light-gathering surfaces, aircraft bays, managerial residences. To Turk I suppose it looked improbably gaudy, but I knew (because Treya had known) that every material and every surface served a purpose—black or white facades to sink or radiate heat, blue-green panels doing photosynthetic work, ruby-red or smoky indigo windows to block or enhance particular frequencies of visible light. The setting sun gave it all a soft, seductive sheen.

The part of it that was intact, at least. There was enough of Treya in me to ache at the damage that had been done.