Thaw

We left the station at first light, because first light was when Talla’s flare model said the sky would hold, and I want it in the record that the decision was correct. Everything that happened on the descent happened inside a correct decision. That is the kind of planet it is.

Veyrath’s night is nineteen hours long and it freezes hard — not weather-cold, chemistry-cold, the dense air shedding its moisture and its halogen load onto every face that radiates, so that the dawn plain comes up rimed, a grey-white bloom over the black mineral like salt on old leather. Then RhealRhealThe magnetically active red dwarf Veyrath orbits. clears the ridge line and the rime gives up. It does not melt the way frost melts at home, soft and general. It goes channel by channel. The plain is fracture country under its skin, shallow thermal cracks veining every shelf, and the melt finds the cracks and runs in them, dark threads spreading through the low ground while the high ribs dry, and for about an hour the whole country is a circuit being assembled in front of you: wet lines closing between dry islands, conductivity climbing with the light.

Rao had taught the rule on day two, off Nae’s note, and the rule had a rhythm by now, like everything Rao taught: wet mineral carries. Dry rib walks. Thaw hour, you treat every dark line like a live bus, because it is one.

We came down off the ridge in march order, loads redistributed for the descent: Lyren on point, Ithe reading the ground, then Halek, then Rao and I with the recovery frames, then Benji with the filter panniers, Voss at sweep. Forty kilos of cartridges between three of us, off-count, downhill, in a quarter again of our weight. The Clickers were out on the drying shelves with their plates spread to the sun, and their clicking had the regular, contented, machine-shop sound it takes in strong light, and I had learned to like that sound, which tells you how far gone we already were: I had learned to like the sound of a hundred thousand sensors confirming they could hear us.

The channel country sits in the last kilometre before the open plain — a broad apron of fractured shelving where the ridge’s drainage, such as it is, finds its way down. Ithe walked it twice before she let us into it, and she set the line the way she set everything, with no inflection and no margin: dry ribs only, one body on any panel at a time, loads forward before any wet crossing. We moved through it like that for twenty minutes, one at a time, calling the panels.

Benji was mid-apron, on a dry rib the width of a door, with the panniers, when the Clickers stopped.

I have tried to write the sound of it and there is no sound to write. That is the entire phenomenon. A plain-wide workshop of small regular percussion, withdrawn between one step and the next, all of it, at once — not faded, removed, the way a value is removed from a table. The first time it happened, on day six, Mikel had laughed at our faces. By the storm we knew better. By the station sortie the rule was reflex, and the reflex is this: when the Clickers stop, do not move. The swarm has frozen its own sampling. Whatever shifted the field that abruptly is something the planet’s own instruments declined to test, and you do not volunteer.

So we stood. Seven statues on a drying apron, loads cutting into shoulders, and the only sound was the tick of the shelves taking up the sun and the running of the melt in the channels.

And the melt kept running. That is the collision, and I want it set down with the clarity it deserves, because afterward there were people aboard who needed it to have been an error, somebody’s error, anybody’s, and it was not. The freeze rule said do not move. The thaw rule said do not stand in reach of conductive wet. Both rules were correct. Both rules had been paid for. And the channel on the upslope side of Benji’s rib was filling while we stood, the dark thread widening at the rate of the morning, ten centimetres from the edge of his boot print, then five.

“Channel’s filling on my left,” Benji said on the crew band. Twenty-five years old and his voice was level. Survey-born; he had been doing emergencies since before he could read. “Requesting relocation. Two metres, dry rib, my right.”

“Hold,” Voss said, from sweep, flat. The silence rule outranked. It had to. We had buried the man who taught us suit drills eleven days earlier because a rule got outranked in the other direction.

The Clickers stayed silent. The thread widened. I was forty metres upslope with a frame on my back and I have done the timing from my own suit log since, because I am what I am: the silence ran ninety-one seconds, and Benji held for eighty-eight of them, and the melt reached the edge of his print at about eighty, and the last thing in his transmit log, before the step, is not a word. It is an exhalation with the discipline still in it.

He stepped for the dry rib. Two metres. He was fast and balanced and carrying well, and he put his lead boot down on a surface that had been dry rock when Ithe walked the line and was a skin of wet over fracture now, and the mesh under the wet took the pressure a fraction late, the way it does, each filament stiffening around the boot, and then the charge moved.

What it looks like is wrong in a way I will not decorate. A man does not fall when the ground takes him like that. He locks. The suit telemetry calls it an attitude event and the body calls it nothing because the body is no longer being consulted: every long muscle closing at once, a jitter through the frame of him too fast to be movement, and then the shelf under the wet — already cracked, already levered by the night’s freeze and the morning’s expansion — let go along its seam, and the channel was not ten centimetres deep where it counted. It was a fracture vent, melt-fed, running with dark water and live with the whole apron’s charge, and it accepted him to the chest, and then past it.

Voss was moving before the rest of us had finished not moving — sweep position exists for exactly this — and Voss stopped six metres out, at the last dry rib, with the retrieval tether already off his shoulder and the anchor loop already in his fist, and did not throw it.

I want the record to hold what that not-throwing was. The vent walls were wet mineral. The melt was rising with the morning and would rise for an hour. The suit’s biometric layer had gone to flatline nine seconds after the attitude event and the fracture was carrying enough potential that Voss’s glove sensors were alarming at six metres. Any body on that wet, any line into that channel with a hand on the other end of it, was a second entry in the same log. Voss is a quarantine veteran; he has stood at more sealed doors than any of us; and he stood at this one and ran the arithmetic that his whole life had trained into him, the arithmetic where the answer costs you something either way and you pay the smaller bill, and he made the decision before command could arrive to make it, because that, too, is what sweep is for.

By the time Lyren came back down the line there was no decision left to make. There was a man at the edge of a vent, coiling an unused tether, by feel, in perfect loops, his eyes on the water; and there was the water; and there was the sound, which had returned — the Clickers ticking over again, all across the apron, regular and warm, the field’s instruments resuming their sampling now that the event was filed.

“Report,” Lyren said.

“Cale is gone,” Voss said. “Body unrecoverable. My call.”

Lyren looked at the vent for the length of one breath. Whatever happens to a commander in that breath is not visible from outside and is none of the record’s business. “Confirmed,” he said. “Log it to me, not to you.” Which was Lyren entire: the call was correct, therefore the weight of it went up the chain, where weight goes.

Ithe re-walked the line and brought us out of the channel country one at a time, and at the apron’s edge she stood for a moment looking back at the country that had been within her competence an hour before, and made the new rule on the spot, in the voice with nothing in it: “No channel crossings in the first hour of light. Ever. Loads go over on a thrown line. A person is not a load.”

We redistributed twelve kilos of breathable future from a dead man’s panniers among five suits and walked home across the open plain in the high morning, off-count, and the Rib Arrays stood out on the flats with their vanes spread to the sun, discharging, humming their single mineral note, and none of them oriented toward us at all. We were not, that morning, the most interesting thing on the plain. I have thought about that since.

Anwen counted us through the perimeter on the lock channel. She counted six. She did not ask. A Pelion comms officer with a mourning sleeve does not need the difference explained between the number that went out and the number that came back; she logged the six, and certified the log, and touched her forearm once, precisely, and let us in.

I carried Benji’s filters to the scrubber bay myself. Nobody assigned it. There is arithmetic in grief too, and mine said that the man had died under the weight of the breath he was bringing back for the rest of us, and the least his colleague could do was finish the carry.

ICSEV MERIDIAN — SURFACE SUIT LOG EXTRACT

UNIT 19 — CALE, B. — SYSTEMS — STATION SORTIE RETURN

0639:54 integrity green / O2 67% / load 21.8 kg

0640:31 crew band: "channel's filling on my left.

requesting relocation. two metres, dry rib, my right."

0640:36 command band: "hold."

0641:09 ground-potential alarm, left lateral

0641:12 attitude event — fall — logged

0641:19 attitude event — fall — logged

0641:21 biometric layer: no return

note: both attitude entries pass integrity self-test.

no clock fault found. carrier layer continues 41 s after

final biometric. content non-speech. filed: interference.