The salt holds your weight if you walk it like you mean it and swallows you to the knee if you don't, so I walk the flat like I mean it, every night, out past the last camera to the dead shaft while the company sleeps and the pumps count down to the exhale. Forty minutes across the white at three thousand eight hundred meters, no light, no vehicle, no bottled air. A baseline can't make that walk. That's the whole reason I get hired to make it. You want something carried across the Atacama-Puna at altitude in the dark, you don't call a person. You call a guanaco.
That's the catalog word for what they made me. Altiplano-forged, the polite version, camelid line spliced through a human frame so the body works where the air gives up. My blood carries oxygen the way a sponge carries water, thick and greedy, so the thin air up here reads to me like sea level reads to you. My lungs filter dust and grit and the fine salt the wind lifts off the pans. My body cycles water so tight I can drink once at dusk and not think about it again until the next dusk, wring every drop back out of myself before it leaves. They built me to belong on the one kind of ground nobody else can stand on. They put that in a brochure. Horizon Minerals shows the brochure to the Compact every time the permit comes up for review, the gene-forged worker who thrives at extraction altitude, no rotation needed, no medevac line, no liability. The brochure leaves out what the water does once it's inside a body built to keep all of it.
I'll get to the water. Let me get to the score first, because the score is why I was out on the flat the night the strike vote came due, and the score had a clock, and the clock was the exhale.
Patricia Mendoza drilled the core herself. She runs brine management for Horizon, an engineer, the kind who still believes a leak is a problem you fix instead of a number you carry, and three weeks ago she put a diamond bit down through the salt crust into the recharge zone under the easternmost pond and pulled up a meter of layered evidence: white salt, then gray, then a band the color of a bruise where the brine has soaked down through the aquifer feed. She sealed it in a survey tube, the kind rated to hold a sample stable for a century, and instead of logging it she hid it down the old number nine shaft, an abandoned exploratory bore at the dead edge of the operational zone, and then she came to Javier Roca, and Roca came to me.
"Vasquez has the medical," Roca said. We were in the central camp, past dark, where the Compact police don't come. "Three years of it. The child's case file. The altitude records they keep filing as pre-existing. Tomorrow the vote passes, and a strike with documented health justification is a labor action the Compact has to answer in law. A strike without it is just twelve thousand people Horizon gets to call a disruption." He had the flat patience of a man who has counted his own people. "The medical proves we're sick. The core proves why. The journalist needs both in her hands before the vote, or the company drowns the medical in a hearing that takes two years we don't have. You walk the core out. You're the only one who can reach the shaft and be back before light without crossing a camera or a road."
"Why's it down a shaft," I said. "Why not in her pocket."
"Because the shaft fills," he said, and I understood, because everyone on the plateau understands the exhale.
Here's the flat, so the rest makes sense. Horizon pumps the spent brine into evaporation ponds and lets the altitude sun cook the water off, and on a cycle the pumps reverse to balance the field, and when they reverse the ponds breathe out. Chemical fog, heavier than air, the smell of metal and ammonia and something sweet underneath that you learn to be afraid of. It rolls off the ponds and pours downhill and finds the low ground, and number nine shaft is the lowest dead ground at the east edge, so when the field exhales the shaft fills from the bottom up like a glass. Nineteen minutes, every cycle. Then the pumps right themselves and the fog burns off in the dry and the shaft is air again until the next one. The window between exhales is the only time you can be down the shaft and breathing. Mendoza knew that when she hid it there. She hid the proof of the poison inside the poison, where the only thing that could go and get it was a body the poison was already taking apart.
I had the window timed. I went down between exhales.
The shaft is hand-over-hand on a rusted ladder forty meters into the dark, and the dark down there is wet and close and tastes of the last fog that hasn't fully cleared, and my lungs did the thing they were built to do, sieved it, kept me clean a little longer than a baseline would have stayed clean. That's the gift. The gift is always also the trap. A body that holds the air longer is a body that holds the bad air longer too, sips it, lets it sit, the way mine sips and holds the field water until everything the water carries has had time to settle into the meat of me and stay. I climbed down into a thing designed to kill the men I work beside in five years and me in two, and the only reason I could climb down into it at all was that it was already inside me, so the dose meant less. You stop being afraid of a room you already live in.
The core was where Roca said, wedged in a dry niche above the old sump. A meter of salt and gray and bruise in a tube heavier than it had any right to be. I clipped it across my back and started up, and at thirty meters the field exhaled early.
It was not supposed to exhale early. I had the cycle to the minute and the cycle lied, or somebody changed it, and I felt the fog come up the shaft under me before I smelled it, a pressure on the backs of my knees like cold water rising, and then the smell, metal and ammonia and the sweet thing, climbing the ladder faster than I was. Nineteen minutes of poison filling a glass with me at the bottom of it.
I climbed. My lungs sieved what they could and what they couldn't sieve they passed into the blood, and the blood took it the way the blood takes everything, greedy, and somewhere around twenty meters my hands started to do a thing they have started to do this past year, a fine shake, the early signal of the load coming due. Up here we don't call it Drift. The catalog calls it Drift, the slow coming-apart they built into every forged line so the warranty has an end. We call it the salt going to your hands. Same thing. Kinder grammar. My hands shook on the rungs forty meters up a fog-filling shaft with a meter of evidence on my back, and I climbed on them anyway, because the alternative to climbing on shaking hands is staying down there with the thing that makes them shake, and I have never once chosen to stay.
I came out of the shaft head and shoulders into cold clean dark air and lay on the salt and breathed, and the flat was white under no moon, and the core was on my back, and a man was sitting on a hardcase forty meters off waiting for me to be done dying or not dying so we could talk.
I knew him by the kit. The security contractor Horizon flew in last month, the one Vasquez is afraid of, the one whose job they wrote down as auditing camp access records. He audits people. He had a long gun across his knees and he didn't lift it, which told me more than lifting it would have.
"That's a hell of a walk on a forged set of lungs," he said. "I had a vehicle and bottled air and I still had to wait an hour at the road. You people are wasted on this."
"You changed the cycle."
"I moved the pumps up eleven minutes." He said it the way you'd admit to closing a window. "I wanted to see if you'd come up the ladder or stay down. The ones who stay down, that's a different report. You came up. Good. We can do business or we can do the other thing, and the other thing is paperwork for both of us."
"I'm carrying a strike out of here," I said. "Not selling it to you."
He almost smiled. "You're carrying a meter of salt that says the brine reached the recharge zone. I know. I read Mendoza's logs before I burned them. Here's the part Roca didn't tell you, because Roca doesn't know it." He stood, slow, gun still down. "We already have that data. We've had it three years. Horizon knows the pond leaks. NAF knows. The number isn't forty years and it isn't twenty-five, those are the Compact's numbers, ours is better than that, ours is exact, and you want to know how it got exact?"
"You measured the water."
"Water's slow," he said. "Water you have to model. We don't model. We read." He nodded at me, at my hands, at the shake I was trying to keep off the strap. "We staffed this field with your line on purpose. A body that cycles water that tight concentrates everything the water carries, and it does it years ahead of a baseline, in a curve so clean you could set a clock by it. Vasquez keeps her medical records like they're a weapon. They are. They're our weapon. Every chart she files on a forged worker going to the salt in his hands, every altitude case she swears is the brine, that's our gauge reading. You're not labor that got sick. You're the instrument. We didn't poison the canary by accident. We bought the canary at catalog price and we read the canary, and the canary's been telling us to the month how long this field stays profitable before a baseline gets sick enough that the law has to notice." He let that sit. "The core's nothing. The core's last year's news in a tube. What's new tonight is you walking it to a journalist and twelve thousand people voting in four hours to put their bodies in front of it. That's the only number that ever mattered, and it's the one we can't read off a chart. So. Sell me the tube. Walk back to camp. Vote no in the morning. Live the two years out quiet in a clinic I'll pay for."
I have been offered the clinic before. Every forged on this plateau has been offered the clinic. It is the cleanest offer the company makes, and it is the worst one, because it only ever costs you the thing the offer is for.
The run down the plateau was the second walk and it earned the straightness of telling it straight.
I went west off the flat the way the vehicles can't, down the scree the road switchbacks around, and he had the road and the bottled air and I had the dark and a body that holds the dark, and for the first kilometer that was enough. Then the early exhale caught the low wind and came down off the ponds behind me, the whole field breathing out at once, and the fog poured down the slope on the same line I was running, and I ran inside it because inside it his optics were as blind as my eyes and my lungs were the only set of lungs on that slope still pulling anything worth pulling. The gift and the trap, one more time, the last time. I outran a man through the one weather that was killing me because it was killing me slower than it would have killed him. He stopped at the fog line. He's not paid enough to walk into the exhale on baseline lungs, and he knew I knew it, and he let me go, because a contractor who reads bodies for a living had already done the arithmetic on mine and decided the salt in my hands would finish the job his report would have started.
I came into the camp edge at the gray hour with the core on my back and the fog combed out of my coat and my hands shaking so plain I had to carry the tube against my chest with both arms like a child.
Sable Rourke was where Roca said she'd be, at the back of the medical tent, recorder already running, and Vasquez was beside her with three years of charts in a hard folder, and there it was, both halves in one room, the medical and the core, paper enough to make the strike a thing the Compact would have to answer in law instead of in force. I put the tube on the table. I had walked it out. The job was done and paid the second the tube touched the wood.
And I stood there in the gray with the job done and understood that the contractor had told me the truth, which is the cruelest thing he could have done. The paper was real and the paper would help and the paper was also last year's news in a tube. Horizon had priced the core. Horizon had priced the hearing, the two years, the medical, all of it, read clean off the bodies of my own line a chart at a time. The one number they had never been able to read, the only number they were afraid of, was the one no instrument gives you. Whether the canaries, having spent their whole engineered lives being read, would stand up in a room at dawn and be the proof out loud, with their own shaking hands held up where the cameras and the Compact and twelve thousand votes could see them.
Vasquez reached for the core. I kept my hand on it a second longer than I needed to.
"The tube proves the water," I said. "It won't prove the rest. The rest they read off us, and a chart in a folder reads like a chart. They've been counting on us being data our whole lives. Quiet. On paper. Filed." My hands were shaking on the tube and for once I didn't try to still them. "Put me at the vote. Not the file. Me. Hands up."
Rourke's recorder was running. Vasquez looked at my hands the way a doctor looks, and then the way a person looks, and she didn't argue, because she had been writing those hands down as a number for three years and she had always known they were a person.
So I'll tell you where the line is, since the flat is full of lines and they all turn out to be the same one. There's the salt line you walk like you mean it. There's the line of us in our insufficient respirators going to shift at sunrise, the company's favorite photograph. There's the bruise line in the core where the brine crossed into the water the whole hemisphere is counting on. And there's the line the company drew through every one of us the day they bought us at catalog price to be the gauge they'd never have to call a poisoning, twelve thousand needles in twelve thousand quiet dials, reading out the end of the field to anyone with the charts and no eyes for the hands.
The sun comes up fast on the Atacama-Puna. White crust, blue sky, the machinery laid out across the only flat geometry for a hundred kilometers, and at the edge of the operational zone the line of workers walking to a shift that isn't going to happen this morning. I was at the front of the room when the vote opened, where the cameras were, with my respirator off and my hands up and shaking so the whole camp could watch the salt come due in them in real time, a body reading itself out loud for once instead of being read. The flat went white behind us all the way to the Andes. Somewhere east of it the dead shaft was breathing fog into the dark for nobody, filling and clearing on its cycle, faithful, the way everything up here keeps doing the small dumb job the old world wound it up to do. I held my hands up until they ached. They'd been an instrument my whole life. I wanted them to be a witness once before the salt took them for good.