The Warm Seam of Pelloran

Radar Bench

The radar bench hummed under Nkem Obiora's palms. The latest swath from the lander's overflight came down the trace in slow amber bands, the ice of Pelloran laid open one strip at a time. She had been reading ice like this for most of her working life. She could tell old ice from young ice by the way the returns softened, and she could tell brine from bedrock by how the signal died. This swath was nearly the last of the contract. The landing grid for whoever came after them was almost filled in, every safe pad marked green, every thin shelf marked red, and the work had settled into the dull, satisfying rhythm of a job done well.

She tagged a pad, moved on, and tagged another. Then she stopped.

Near the eastern lip of the Chalice Crevasse, deep under the ice, the reflection went strange. It wasn't a hole and it wasn't a void. It was a narrow, bright smear where the ice lost its grip on the signal. Warm ice did that. Ice near its melting point turned murky to radar, the way a window fogs. The smear ran along the crevasse wall like a vein under skin.

Nkem leaned closer until the bench light washed her knuckles pale. She rolled the swath back and played it forward again. The thread was still there.

"You've gone quiet," Marguerite Fenn said from the galley alcove behind her. The medic had a pouch of tea clipped to her sleeve and a scanner balanced on her knee, running the weekly bone-density checks she insisted on even this close to home. "Quiet means either you've found something or you've fallen asleep with your eyes open."

"Something in the Chalice."

"Something good?"

"Something warm." Nkem heard how it sounded and didn't take it back. "Or a bad return. Probably a bad return."

Marguerite drifted over, one hand on the overhead rail, and peered at the amber trace with the polite blankness of someone who read bodies, not ice. "That brighter bit?"

"That brighter bit shouldn't be there. Everything around it is cold and clean. Then there's this seam, right against the crevasse wall, where the ice goes soft." Nkem traced it without touching the screen. "Could be salt. Could be the radar ringing off the wall geometry. The Chalice is a nasty shape. It throws echoes back at you."

"And if it isn't salt or echoes?"

Nkem didn't answer. Out past the bench window, Pelloran turned beneath the Meridian Ash, white and cracked, the crevasse a dark scratch near the terminator. Far behind it hung Ostry, the gas giant that squeezed this moon a little with every orbit and kept its insides from freezing solid. Everyone who came out here knew that much. Nobody had found a warm place shallow enough to reach.

She keyed the intercom to the lander bay. "Dagny. Are you elbow-deep in something?"

"Always." Dagny Rhee's voice came back tinny and distracted. "Lander's got a sticky valve I'm sweet-talking. What do you need?"

"The probe we dropped near the Chalice last week, the shallow test. Did it log temperature on the way down?"

"Everything logs temperature. Why?"

"Can you pull it for me? The raw stream, not the summary."

A pause, and the clank of a tool going back into its clip. "Give me a bit. I'll have to dig it out of the tether buffer."

Nkem let go of the intercom. Marguerite was still watching her, and she had the medic's habit of watching the person instead of the screen.

"You'll want to tell Pavel," Marguerite said.

"When there's something to tell." Nkem kept her eyes on the trace. "If I go to him with a smudge, he'll tell me it's a smudge, and he'll be right. He'll ask what it costs, and he'll be right about that too."

"He usually is." Marguerite unclipped her tea and turned the pouch in her fingers. "He also usually listens to you. That's not the same thing as agreeing, but it isn't nothing."

Nkem felt the heat climb her neck and was glad of the dim bench light. Twelve years of surveys had put her in a lot of cramped cabins with Pavel Ostergaard, and somewhere along the way his opinion had become the one she braced for first. She hadn't said so to anyone. She suspected Marguerite had noticed regardless.

"Go eat something," Marguerite said, pushing off toward the hatch. "You skipped the last meal. I keep track of these things."

She didn't eat. She pulled up the cargo manifest instead, the way some people bite their nails, and scrolled to the line near the bottom: Obiora, core archive, titanium canister, sealed. It was riding home strapped in the cargo bay, the cores she'd gathered across her whole career, welded shut at Brask Station before they ever left. Every cold place she'd drilled was in that canister. None of it had ever been warm.

She closed the manifest.

The hatch to the lander bay cycled open, and Dagny came up the spine corridor hand over hand. She had a smear of lubricant on her jaw and a scuffed slate tucked under one arm. Past her shoulder, through the open hatch, Nkem could see the probe rack. Both melt-probes lay in their cradles, two slender steel lances Dagny had assembled and brazed herself during the long cruise out, their heated tips capped in orange. The shallow test had used a disposable sounder. Neither of these had touched ice yet.

"You're making the face," Dagny said.

"I don't have a face."

"You have a face. It's the one where you've already decided and you're hoping the data catches up." Dagny hooked a foot under the bench rail and anchored herself. She didn't hand over the slate. "First I want to know what I'm looking for, so I don't see it just because you told me to."

Nkem respected that. She showed her the smear on the radar, the seam along the crevasse wall, and kept her voice flat. "If the ice is warm there, your sounder should have felt it on the way past. If it didn't, I'm chasing an echo and we finish the grid tomorrow."

Dagny studied the trace for a long moment. Then she looked at Nkem, and some of the joking went out of her.

"I already pulled it," she said. "I pulled it twice, because the first time I thought the sensor had glitched. Then I checked the sensor, and it hadn't."

"Show me."

"There's more than heat." Dagny turned the slate over in her hands but still held it. "The sounder sniffs what it melts. Mostly it tastes nothing, just clean water from old ice. Right where it passed closest to the seam, it tasted things that don't belong together. Chemistry that ought to have settled down a long time ago and hasn't." She frowned at her own words. "I'm an engineer, Nkem. I fix valves. I don't know what that means."

"It means something keeps stirring it." Nkem's mouth had gone dry. "Or something keeps using it."

The bench hummed. Somewhere aft, a pump changed pitch and settled. Neither of them said the word, because saying it would make it a claim, and a claim would have to be defended.

"We're nearly done," Dagny said quietly. "The window doesn't move. Pavel's going to look at this and see a lot of fuel."

"I know."

"And you're going to ask anyway."

"I don't know yet." That was the truth, and it frightened her. "I want to be sure before I ask anybody for anything."

Dagny let out a long breath. She glanced back toward the open hatch, toward the two probes in their cradles. Then she unhooked her foot from the rail and held the slate out across the bench.

Nkem took it. The diagnostic trace ran in green down its scuffed face. The cold line was flat and patient, then jumped hard right where the sounder had slid nearest the Chalice wall, then fell flat again. The chemistry readout sat beside it, and the flags Dagny had set were still blinking. It wasn't a smudge or an echo. The seam was real, and she was holding it in both hands.

The Pulse

The second sounder trace came in just after the ship's morning, and Nkem watched it build one line at a time, as though the ice were deciding how much to tell her.

Dagny hung beside her in the survey bay with one foot hooked under the rail, chewing the tab of a ration pouch she had forgotten to open. They had dropped a fresh disposable sounder overnight, a little farther along the Chalice wall, and set it to sit and listen instead of passing by. Now the warm line climbed, crested, and slid back down. Then it climbed again.

"That's the same shape," Dagny said.

"Wait."

It rose a third time. The rise wasn't ragged and it didn't wander. It came up like a slow tide, held, and let go, and the chemistry flags woke and went dim right along with it. Nkem laid the earlier traces over the new one with two fingers, stretching them until the peaks lined up. They lined up cleanly. Whatever was pushing warmth into that seam was doing it on a schedule.

"Could be tidal," Dagny offered. "Ostry squeezes the whole moon every orbit. Ice flexes, water moves."

"It could be." Nkem had already checked, in the part of her mind that never stopped checking. "The beat's too fast for Ostry. Something under there has its own rhythm." She heard how that sounded and made herself say the rest plainly. "Venting, maybe. A warm spring that breathes. Water that keeps getting fed things it shouldn't have."

"And something drinking from it."

"I didn't say that."

"You didn't have to." Dagny finally tore the pouch open, looked at it, and tucked it back in her pocket uneaten. "He's in the galley. If you're going to do it, do it before he's finished his coffee and starts in on the burn checklist."

Nkem saved the overlay to a slate, then copied it to a second one, because some old superstition told her a thing held twice was harder to lose.

Pavel was sitting at the galley table with his back to the hatch, a bulb of coffee clipped to the edge and the departure plan glowing in front of him. He had shaved. He always shaved before a burn sequence, even days out, as if the ship might notice. He looked up when they came in, and his eyes went from Nkem's face to Dagny's and back, and Nkem saw him read them both before either spoke.

"Grid's done?" he asked.

"Nearly. Two swaths left."

"Then why do you look like that?"

She set the slate on the table and turned it toward him. She didn't sit. She walked him through it the way she would have walked a review board through it: the smear on the radar along the crevasse wall, the warm spike from the first pass, the chemistry that wouldn't settle, and now the rhythm. She kept her voice level and let the trace do the talking. Pavel listened without interrupting. He pulled the overlay larger with his thumb and watched the peaks rise and fall, and for a moment his face did something she hadn't seen it do in a long time. It went young.

Then it closed.

"How long have you had this?"

"Since yesterday. I didn't want to bring you an echo."

"Yesterday." He set the slate down very gently. "And Marguerite?"

Dagny shifted. "She was in the bay when I pulled the first sounder."

"So I'm last." He didn't sound angry, exactly. He sounded like a man noting a gauge he would have to come back to. "All right. Say it, Nkem. What are you asking for?"

"A sortie. Take the lander down to the Chalice lip, set a melt-probe beside the seam, and let it go down and taste the water itself. We carry two. We'd only need one."

"We carry two because the contract budgeted for a deep core at the landing site, and we decided we didn't need it." He tapped the plan. "You know what's in here as well as I do. The lander's burned what it was supposed to burn. Every sortie we didn't plan comes out of the margin on the return. Day eleven doesn't move. We miss it and we don't go home on a bad trajectory, we don't go home for a very long time, and nobody out here has the food for that."

"I know the margins."

"Then you know they're thin already. I'm not inventing that."

"You're not." She meant it, and that made it harder. "But look at it, Pavel. Look at what it's doing. We came out here to measure how thick the ice is so somebody can land on it someday. If there's something living under it, they need to know before they land, not after."

"Then we report it. We hand them the trace and the location and they send a proper mission with proper fuel."

"In how long? You've seen how these things go. They'll argue about it for years. And the sounder's a guess. A probe in the seam is evidence."

He rubbed his jaw, the clean-shaven skin, and looked at her across the table with an expression she had learned over a lot of years and a lot of ships to be careful with. It was the face he wore when he wanted to give her something and couldn't afford to. He had worn it once in a bad storm on a supply run, when she'd begged for another pass over a ridge and he'd turned the craft away, and later, in the dark, he'd told her he was sorry, and she had told him he was right, and neither of them had said anything else at all.

"No," he said. "Not a sortie. Not with a probe drop and a loiter at the lip. The Chalice wall is rotten ice. You told me so yourself when we mapped it. I'm not putting the lander down on rotten ice so close to the window."

Dagny cleared her throat. "What about a look? No landing. Overfly the lip low, I fit the lander with a ground-radar pod and a thermal eye, Nkem reads the seam from above. If the ice near the lip is sound, we'd know where a probe could go. If it's not, we come back and we drop it."

Pavel turned to her. "You can fit that today?"

"If I skip lunch." She patted the pocket with the pouch. "Already did."

He was quiet a long time. The coffee bulb ticked against its clip as the ventilation stirred it. Nkem made herself stay still. She could feel the argument she wanted to make rising in her throat and she swallowed it, because pushing him now would only hand him a reason.

"I'll run the numbers on a short hop," he said at last. "Short. Down, one pass along the wall, back up. No landing, no hover, no probe. If anything looks wrong, anything, I call it and you don't argue with me in the cockpit."

"I won't."

"You will. You always do." The corner of his mouth moved. "Just do it afterward."

He keyed the plan, ran something, frowned at the answer, ran it again. Then he unclipped the lander's command key from the lanyard at his neck, the small worn wafer he never let anyone else carry, and held it a moment between his fingers as though weighing it.

"Scouting only," he said. "You bring me the ice, not the life. We talk about the rest after."

He laid the key on the table and slid it across to her, and he kept two fingers on it until she nodded.

Chalice Crevasse

The wall of the Chalice came up out of the dark faster than Nkem expected. One moment the lander's lamps were sliding over the plain, gray and pocked, and the next the ground simply ended and the light fell away into a blue so deep it looked solid.

"Sound ice along here," she said. The radar pod's return scrolled across her knee display, layer on layer, clean and unbroken for a long stretch back from the lip. "That's not rotten. Pavel, look at it. That's a shelf you could park a ship on."

"I'm looking." He kept both hands on the controls, his eyes on the horizon line and the thrust readout and nothing else. "And I'm going past it."

"The thermal eye's got it too." Dagny leaned forward against her straps. "There. The seam. It's warm right now, you can see it bleeding up the wall."

Nkem saw it. A faint smear of false color down inside the crevasse, brighter than the ice around it, the way a cheek brightens under a hand. It was rising. It would fall again soon. She had watched it rise and fall on the bench for a day and a half, and here it was, real, below her boots.

"Set down on the shelf," she said. "Back from the edge. Well back. Dagny and I walk one probe to the lip, drop it, and we're inside before it cools off again."

"No."

"You said if the ice was sound we'd know where a probe could go. It's sound. It's right here."

"I said we'd come back and talk." He banked them gently along the wall, and the blue swung under the window. "We have two melt-probes. We have one lander. We have a return window that closes on day eleven whether we like the chemistry or not."

"And if we come back up, refuel, argue for a day, fly down again, that's a second sortie's worth of propellant on top of this one." She heard her voice climbing and pulled it down. "Landing now is cheaper. You know it is. You ran the numbers this morning."

He didn't answer. Behind her, Dagny was very quiet. The lander drifted, slowing, the shelf sliding past at walking pace beneath them.

"How long," Pavel said.

"Short. In and out."

"That's not a length."

"The probe deploys itself once it's on the lip. We carry it, we seat it, we leave." Dagny's voice was careful. "I built the cradle so one person could do it. Two makes it quick."

He let out a long slow breath through his nose. Nkem knew that breath. He brought them around, picked a place where the radar showed the deepest, flattest ice, and set the lander down so softly she felt it more in her stomach than her spine. The dust didn't billow. It lifted in clean arcs and fell back at once, the way it always did here, with no air to hold it.

"Engines stay warm," he said. "I see one thing I don't like, I call you back, and you come. Both of you. You don't finish the job first."

"We'll come," Nkem said.

Outside, the cold reached through the suit at the soles first, a dull ache climbing through her heels. Dagny unlatched the probe from its rack and they carried it between them, a slender steel needle in its padded cradle, light enough here that the hard part was not letting it swing. The lip was farther than it had looked from the cockpit. Everything was. The ice under their boots was ridged and glassy, and their lamps threw long shadows ahead of them that ended in nothing.

Dagny stopped at the marker she'd dropped from the air. "Here. This is good. Seat it here."

Nkem looked at the display strapped to her forearm. The seam was off to the left and down, and from here the probe would come at it on a long slant through ice that might fracture, might deflect it. A few more steps and it would fall straight.

"Closer," she said. "Just to that ridge. It drops right on top of it from there."

"That's the edge, Nkem."

"It's back from the edge. Look at the return. It's solid to there."

Pavel's voice came over the channel, flat. "What are you doing?"

"Moving the seat a little," Nkem said. "It's fine."

They went forward together. The ridge was a lip of old ice folded up on itself, and beyond it the Chalice opened into its blue, and Nkem, kneeling, could see down into it without meaning to. The wall fell sheer. Far below, the seam would be warming, breathing its slow breath, and nobody in all the history of anything had ever put an instrument into it.

Dagny knelt beside her and braced the cradle. She reached in with her right hand to free the probe's clamp, and the clamp stuck, and she twisted against it hard.

A puff of white burst from her wrist.

It came out silent, a tiny storm of glittering crystals, the suit's warm air freezing the instant it left her. Then another. Then a steady fine plume, catching the lamplight, drifting off over the crevasse in a little sparkling cloud.

"Seal," Dagny said. Very calm. "Glove seal."

Nkem grabbed for her wrist. The cradle tipped. The probe, half freed, slid out of it along the glassy slope of the ridge, slow, so slow, almost lazy in the weak pull of Pelloran. Dagny lunged for it with her good hand and her knee went out from under her, and for a terrible stretched moment she was sliding too, toward the lip, her boots scrabbling at ice that gave nothing back.

Nkem caught the back of her suit by the harness loop and threw her own weight the other way. They both went down hard. The probe went over the edge and was gone, its tether unspooling behind it in a silver thread, then the thread was gone too.

"Come back," Pavel said. "Now. Both of you. Dagny, talk to me."

"I'm venting." Her breath was coming fast in the channel. "Right glove. It's at the cuff. I can't feel..." She stopped. "My fingers are going."

Nkem clamped both her gloved hands around the cuff and squeezed, and the plume thinned but didn't stop. The suit's warning tone was going in her ear now, a thin high complaint. Through Dagny's faceplate her face had gone gray and tight.

"Patch," Nkem said. "Where's your patch kit?"

"Left thigh."

She couldn't let go of the cuff to reach it. She couldn't hold the cuff and walk them both back. For a moment, kneeling on the ridge with the blue at her back and the lander's lights small and far away, she didn't know which to do, and she understood that whatever she chose, Dagny's hand was going to pay for the time she took choosing.

"Hold it yourself," she said. "Left hand over the cuff, hard as you can. Hard."

Dagny did. Nkem tore the patch kit free, ripped the backing, and wrapped the cuff twice, three times, pressing until the last of the crystals stopped. Then she got under Dagny's arm and hauled her up.

They walked. It felt like a long time. Dagny didn't speak, and her breathing in the channel went ragged and then very even, which was worse. Pavel had the lander's ramp down and was standing at the foot of it in his suit when they reached him, though he'd said he would stay in the cockpit. He took Dagny's other side without a word.

Inside, with the hatch sealed and the air back, Nkem got Dagny's helmet off and then the glove, working it loose a finger at a time. The hand underneath was white. Waxy white, from the knuckles out, the fingertips gone pale and strange and hard-looking, like something carved.

Dagny stared at it. "Huh," she said, very small.

Pavel was already strapping in. "Marguerite's on the channel. She says don't rub it, don't warm it fast, keep it against body heat and get it to her." His hands moved over the controls. "Strap in. We're lifting."

The lander rose. The shelf fell away, then the dark lip, then the whole long blue throat of the Chalice, and Nkem did not look down into it. She sat beside Dagny with her suit open to the waist and took the white hand and laid it in her lap, against her belly, and folded her own warm hands over it.

"One probe," Dagny said. "We've got one left. It's racked. It's fine."

"Don't."

"I'm just saying it's fine."

In the pilot's seat Pavel didn't turn around. Nkem could see the back of his neck, the tendons standing out, and once, when the lander jolted crossing into the long climb, his head moved a fraction, as if he meant to look back at her and then decided not to trust himself to do it. She thought of the dark after the storm, years ago, and the two of them saying almost nothing.

The cabin was very quiet. Dagny's hand lay cold and still in her lap, and Nkem held it there, and felt the first faint warmth of her own body begin, slowly, to go into it.

Cargo Bay

Marguerite had Dagny's hand in a basin of warm water strapped to the medical bench, and the water was held there by a mesh lid. The lid kept the surface from creeping up the sides in the ship's thin spin. Dagny sat with her jaw set and her eyes on the ceiling.

"This part hurts," Marguerite said. "It's supposed to. Pain means the tissue's talking to us."

"It's saying a lot." Dagny's voice cracked on the last word. Her fingertips, under the water, had gone from wax to a mottled, angry red, and two of them were already swelling into blisters.

Nkem stood in the hatchway with her arms crossed so she wouldn't reach for anything. "Will she keep them?"

"Ask me in a week. Ask me in a month." Marguerite checked the water's temperature with the back of her own wrist, an old habit she'd never dropped for the sensor. "The index and middle fingers I don't like. The rest I like better. She won't be brazing anything for a while."

"I can braze left-handed," Dagny said.

"You can sit," Marguerite told her.

Pavel was in the corridor behind Nkem. She hadn't heard him come. He had a tablet in one hand and he didn't hold it out to her, just let it hang against his leg like something heavy.

"I ran it again," he said. "Three times. Different trajectories, different reserve assumptions."

"And?"

"And there's nothing. Yesterday's sortie ate what we had. Another descent and climb puts us short on the return burn. Not by much, but by enough. We'd make the departure on day 11 and come in long, and long means a correction burn we can't pay for, and that means drifting past the inner station with nobody close enough to reach us." He finally lifted the tablet so she could see the curves. "No margin, Nkem. I'm not being careful. I'm being arithmetic."

She looked at the curves. She'd read his plots for years and she knew he wasn't padding them. That was the worst of it. Pavel didn't pad. He told her the edge and then let her look over it herself.

"What if we shed mass," she said.

"We've shed it. I dumped the spare scrubber stack and the old drill sleeves last night while you were with Dagny."

"Not that."

She went past him down the corridor. After a moment he followed.

The cargo bay was the narrowest space on the Meridian Ash, a long cold slot lined with strapped crates and netting, lit by a single strip that turned everything the color of old bone. The survey cases sat at the front, finished and sealed, the whole contracted job of ice-thickness maps riding home for the people who'd one day land here. Behind them, braced in its own cradle, was the archive canister.

It was titanium, dull and scuffed, welded shut in the Brask Station machine shop before they'd launched. She'd watched them do it. Inside, in cold-locked sleeves, were cores she had pulled from ice on worlds and moons across her whole working life: the banded ones from Ostry's south cap, the gray ones with the dust layers nobody had explained yet, the first core she'd ever chosen a site for herself. There were sleeves she'd never had time to open. She had meant to spend her later years opening them.

She started on the straps.

"Nkem." Pavel's voice changed. "What are you doing?"

"It's heavy. You know how heavy it is. You approved the manifest." The first buckle came free and the strap floated slack in the low spin. "Run your numbers with this gone."

"That's your work."

"It's ice I've already read. What's under the Chalice I haven't read. Nobody has." She pulled the second strap. Her fingers were steady and she was distantly surprised by that. "It pulses, Pavel. Something down there keeps time. We have one probe left and one chance before we go, and I'm not carrying old cores home and leaving that."

"You don't know it's life."

"No. That's why I want to look."

He didn't argue. He stood between the crates with the tablet and his thumb moved on it, and she watched his face while he worked, the small frown that meant he was taking her seriously and hoping not to have to.

She found the jettison tags in the drawer by the airlock, bright orange, the kind with the reflective strip so the external cameras would pick them up. She wrote ARCHIVE on one in grease pencil and then stopped, and then wrote her name under it, because it seemed wrong to let it go without one.

Dagny's voice came over the intercom, thin. "If it's the canister, it's enough. I did the mass sheet on the way out. It's enough with room."

"You're supposed to be sitting," Marguerite said in the background.

"I am sitting."

Pavel lowered the tablet. "She's right. It closes. With room." He said it like a man reading a sentence against himself.

"Then let me go down."

For a long moment he said nothing. The ship ticked around them as hull plates settled against the cold. She thought of the night after the storm on Ostry years ago, the two of them in the dark shelter with the beacon down, not touching, talking about nothing so they wouldn't have to talk about whether anyone was coming.

"One sortie," he said. "One. I fly it. We land where I say, on ice I've seen, and when I say lift, we lift, whatever the probe's doing. If it's halfway down, it stays down. Dagny doesn't leave the ship."

"Yes."

"I mean it."

"I know you do. That's why I asked you."

She tied the tag through the canister's lifting eye and pulled the knot tight. Together they walked it off its cradle; even light, it had a stubborn weight in the turns, a mass that wanted to keep going. They eased it into the airlock and set it against the outer door, and she backed out and keyed the inner hatch, and the glass panel showed it sitting there alone in the small white space with its orange tag turning slightly in the air currents.

She found she couldn't stop looking at it.

Pavel was very close behind her. The bay didn't leave room to be anywhere else. She turned and he was there, and his face had the look it had worn on the lander climbing out of the Chalice, the look he hadn't let her see.

"Twelve years of it," he said quietly. "Longer. I watched you carry those cores like they were…"

"They were."

"I know."

He put his hand against the side of her face, carefully, as though she might be something that could crack, and then he kissed her. It was not quick. It tasted of recycled air and the bitter coffee he lived on, and her back was against the cold netting of the crates and she didn't care. When they came apart neither of them said anything that would have explained it. There wasn't anything that needed explaining. They had been carrying it as long as she'd carried the cores.

"Tomorrow," he said.

"Tomorrow."

He went forward to rebuild the burn. She stayed a little longer by the hatch with her palm flat on the cold panel, and on the other side the titanium canister sat against the outer door, scuffed and patient, its orange tag catching the light.

Last Probe

The outer door opened without a sound. Nkem watched through the glass as the cabin air left in a soft white breath of ice crystals, and the canister went with it. It did not tumble at first. It slid out backward, unhurried, the orange tag flattening as the last of the air thinned. Then it was outside, turning slowly end over end, catching sunlight on one face and Pelloran's pale glow on the other.

"Separation clean," Pavel said from the forward hatch. He didn't come closer. He had told her he wouldn't, and she was grateful.

She kept her palm on the panel until the canister was a bright point, then a point she had to hunt for, then a point she could only find because she knew where to look. It held every core she'd pulled since her first season: the blue ice from Ostry, the gritty layered ones, the core that had taken her three tries and most of a winter. All of it was falling now along its own slow orbit, and nobody would ever cut it open.

"Nkem."

"I'm coming."

She didn't look again. That was the only way she could leave it.

In the lander bay, Marguerite was already strapping in, her medical kit wedged under the seat. Dagny sat on the bench by the racks, her right hand wrapped thick in white gauze and held against her chest in a sling Marguerite had made from a cargo strap. Her face had the gray tightness of someone who hadn't slept and wasn't going to admit it.

"You're supposed to be in the infirmary," Nkem said.

"I'm supposed to be on that lander." Dagny lifted her chin at the probe on its rack: a slim steel needle, taller than any of them, its brazed seams still dull from her torch. "I built the thing. I'm not watching it go in on a camera feed while I lie in a bunk."

"Pavel said--"

"Pavel's right. I know." Dagny's jaw worked. "So I'll be on the radio. Every step. You don't touch the release without me in your ear."

Marguerite leaned out of her harness. "And you'll stay seated at the console the whole time, and if I hear you've gotten up I'll sedate you remotely."

"You can't do that."

"You don't know what I can do."

Dagny almost smiled.

They loaded the probe together, Nkem and Pavel guiding it into the belly clamp while Dagny called out each lock by its color. Nkem felt the last latch seat under her gloves, a small firm click through the metal rather than a sound. This was the last one. The rack behind it was empty.

Then it was three of them in the lander, and Dagny's voice in their helmets from the ship's console, and Pavel's hands on the controls.

The descent was quieter than the first. No one argued. Pelloran filled the window, cracked white and pale blue, and the Chalice Crevasse opened beneath them like a dark seam stitched across the shelf. Pavel took them down well back from it, onto the sound ice he had walked on two days before, and Nkem felt the struts take the weight and settle.

"Down," he said. "Clock's running." He didn't say how long. He didn't need to. Day eleven was waiting for all of them, and he carried the margins in his head the way she had carried cores.

"Seat's on the map," Dagny said. "Nkem, give me the radar."

Nkem pulled the last overflight swath onto her screen. The warm seam sat below the ice in a faint bright band, swelling and fading, swelling again, on its strange quick rhythm. She had stared at it so long she saw it with her eyes shut.

"Ice here is thinner than the lip site," she said. "Clean all the way down. No fractures I can see."

"You couldn't see the last ones either," Pavel said.

"No." She didn't argue. "But there's no crevasse here. That's the difference."

"Then lower it," Dagny said. "Winch to the surface. Slow."

The belly winch paid out. Through the floor port Nkem watched the probe swing down below the lander, steel bright against the ice, the tether reel turning behind it.

"Stop. Let it hang. Heater on, low."

The probe's head began to glow, a dull red under the steel skin, and then a deeper orange. Where it touched the surface the ice went to vapor and a thin haze rose around it, sparkling and gone almost at once.

"It's biting," Nkem said.

"Don't let it bite crooked. Pavel, is the lander level?"

"Within your tolerance."

"My tolerance is perfect."

"Then no."

A pause on the channel, then a small sound that could have been a laugh. "Fine. Nkem, the second lock. Release it, keep the first."

Nkem reached for the release panel. Her glove hovered over the switch. Somewhere behind her eyes she saw Dagny on the crevasse lip, the white vapor jetting from the cuff of her glove, her hand gone stiff and pale before any of them understood. Two of those fingers might not come back. Dagny had paid for this, and Nkem had moved the seat closer to the edge.

"Nkem," Dagny said, quiet now. "I'm fine. Second lock."

She threw it. The probe sank a little, settling into its own melt.

Marguerite had unbuckled and was kneeling by the floor port. "It's going in straight."

"Tether tension?"

"Good," Nkem said. "It's pulling, not dragging."

"Full heat. Then the clamp's all that's holding it. When you cut it, it's gone. It doesn't come back."

"I know."

"I know you know. I'm telling you anyway."

Pavel looked back at her from the pilot's seat. Whatever he had wanted to say yesterday was there in his face, and something else too, a kind of permission. He didn't tell her to hurry. He just looked at the window, then at her, and waited.

The heater came up. The orange head turned near white. Vapor boiled off the surface in a steady pale plume and froze to glittering frost on the lander's legs.

"Cut it when you're ready," Dagny said. "It's yours."

"It's ours."

"Then cut it before I get emotional on an open channel."

Pavel left his seat. Marguerite shifted to make room, and the three of them pressed close at the floor port, helmets almost touching, Dagny's breathing in all their ears.

Nkem put her glove on the clamp release. She thought of the canister, turning somewhere above them, catching sunlight. Then she pressed down.

The clamp opened. The glowing head slid free, and the probe sank into the ice, sinking deeper with every moment into a bright shaft of its own making, its light fading from white to orange to a dim warm ember far below, the tether spooling after it toward the pulse.