The room was cold in the way of places that had been sealed for a long time and had stopped apologising for it.

  The kind of cold that accumulates in spaces the system has forgotten to maintain, settling into walls over years until the stone holds it the way old wood holds damp. It smelled of mineral runoff and something older beneath that — dust undisturbed since before any of them were born. The air moved nowhere. Sound entered the room and stayed, flattening against the joins instead of travelling.

  Griff ran his lamp across the perimeter before he let anyone drop their pack.

  The room was roughly square. Original construction — the joins between panels were imprecise, the kind of imprecision that came from human hands working to tolerances that had seemed adequate at the time. A maintenance access point in the far wall had been sealed from the inside, the bolts corroded to near-permanence. Two drainage channels ran parallel across the floor, long dry. The ceiling was low enough that Mad had to angle his pack sideways coming through the door.

  No guidance strips. No sensor housing visible. No filament ports in the seams.

  Not unwatched. But not prioritised.

  Jake completed his own perimeter check — nose working the joins, the drain channels, the sealed access point — and returned to the centre of the room. He sat. His tail moved and settled.

  Griff read it.

  "We stop here."

  Nobody argued. The formation had been moving for long enough that stopping felt like a physical weight being set down — the specific relief of a body that had forgotten it was carrying something until the moment it wasn't.

  Packs hit the floor in sequence.

  Mad lowered his last and rolled his shoulders with the careful deliberateness of a man who knew exactly which muscles had been working too hard and intended to have words with them about it. He found a position along the drainage channel, sat, and looked at the room the way he looked at everything mechanical — cataloguing, assessing, checking whether the structure would hold what they were about to ask of it.

  Archie folded down against the far wall and immediately located three things wrong with the ceiling joins that nobody had asked him to locate. "The composite up there is different to the corridor sections," he said, craning his neck. "Pre-modification layer. This room wasn't built into the original architecture. It was added."

  "Added by who?" Scarab asked.

  "People," Archie said. "Look at the bolt pattern."

  "People who are no longer here," Mad said, "having added a room that is very cold. Inspiring."

  Archie opened his mouth.

  "Don't," Mad said.

  Archie closed it. Jake looked at both of them with the expression of a dog who had followed that exchange and found it satisfactory.

  Valley set the phase rig across his knees. His thumb moved along the casing seam — that same unconscious motion, the gesture belonging to a different room in a different life. He looked at the rig's output for a moment longer than the reading required, then set it against his thigh and looked at nothing in particular.

  Don sat with his back to the sealed maintenance panel. His arm rested at his side, the bandage dry in the lamp's reach, the stump beneath it quiet. He ate half a ration with the methodical efficiency of a man who had stopped tasting things at roughly the same time the hand went.

  Scarab took the door position, propped his back against the frame, reached for his kit. Themis sat in his lap.

  Tick.

  He stilled it with his palm. Just kept a hand on it.

  Kyle was the last to settle. He dropped cross-legged near Griff's position and looked at the ceiling, reading the joins. The sensor habit running even in stillness.

  "Elin," Griff said.

  "I know." She did the perimeter — a slow circuit of the walls, fingers running the seam lines at intervals. Her tagged wrist stayed tucked near her ribs. When she completed the circuit she stopped beside Griff and kept her voice low. "Nothing live in the walls. The access point is genuinely sealed — those bolts haven't moved in years."

  "Which means the room isn't part of current routing."

  "Which means the system isn't expecting us to be here." She glanced at Jake, still sitting at the room's centre. "Or it is and it doesn't need sensors in here to know what it wants to know."

  "Both could be true," Griff said.

  "Both being true is the one I'd plan for."

  He agreed. He didn't say so. He didn't need to.

  The formation slept in shifts, though sleep was an approximate word for what most of them were doing — a partial withdrawal from attention, the body insisting on maintenance the mind hadn't scheduled. Griff took the first watch. The lamp burned at a quarter-output against the far wall, enough to read shapes without costing too much of the cell.

  Archie's breathing evened first. His hand stayed flat against his ribs even in sleep, the body maintaining its own accounting.

  Mad went out like a structure under load — abruptly, completely, with the profound reliability of something that had decided the job was done.

  Valley's eyes closed but his breathing didn't settle for a long time. His thumb kept moving along the rig's casing until it didn't. The rig pulsed at its baseline, faint and steady.

  Don slept with his arm loose at his side. The silver thread at his wrist caught the lamp's edge — a faint warmth, regular as a slow tide, pressing and releasing against the bandage at intervals that had nothing to do with his heartbeat. Griff watched it for a while. Placed it in the ledger of things he couldn't act on yet.

  Kyle was the last to close his eyes. He lay facing the ceiling and for a long time he simply looked at it — then his face smoothed and he was gone.

  Elin came and sat near Griff's position without announcing herself.

  "He hasn't said anything about Andrea," she said, at the register that carried no further than two people.

  "No."

  "Not one thing. Since the floor sealed."

  "He said she counted everything," Griff said.

  "That's not the same as saying something."

  "No," he agreed. "It isn't."

  The quiet ran between them — the kind two people generate when they've stopped needing to fill the space and haven't yet decided what to do with what that means.

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  "What do you think is below us?" she asked.

  Griff looked at the ceiling. At the dark beyond the lamp's reach. "Something that wanted us to keep coming. Everything from level one has been routing. Blocking, then routing. It could have sealed us out a dozen times."

  "So we're going where it wants."

  "We're going where it wants us to think it wants us." He paused. "Those aren't the same thing."

  Elin turned her head slightly toward him. Just enough that he was aware of the shift.

  "The system text at the panel," she said. "No names. Just functions."

  "Yes."

  "It's still running its model on us."

  "It never stopped."

  She absorbed that. Her shoulder was near his. The distance that required a choice to close had not changed. Neither of them moved toward it or away. It simply remained — exactly as it was, carrying the weight of being noticed.

  She was quiet for a moment.

  "Griff."

  "Yes."

  "When you told Don to sleep. The way you said it." She paused.

  He waited.

  "Nothing," she said. "Never mind."

  He didn't push it. The thing she hadn't said settled into the space between them and stayed — held, the way you hold something that isn't ready to be put down and isn't ready to be named.

  Across the room Jake's ear twitched toward the sealed vent. Then relaxed.

  Still clear.

  "Get some sleep," Griff said.

  She did.

  Jake did not sleep.

  He moved through the room in a slow circuit — not patrol, not alarm. Something more considered. He checked the drain channels, the sealed access point, the door frame where Scarab sat. He pressed briefly against each sleeping crew member in turn — not the full alive ritual, something shorter, a touch and release, the lightest version of confirmation — and then returned to his position beside Don and held it.

  His eyes stayed open.

  The vent was in the ceiling above the drain channels.

  It opened without sound — a panel articulating inward by three centimetres on a mechanism too precise for its surroundings, the engineering of it belonging to a different decade than the room it occupied. A modification. Something added after the original construction, installed with the patience of a system that planned across longer timeframes than the people who built the space had imagined.

  The drone that emerged was small enough to sit in a closed fist. It moved on six articulated legs, each footfall calibrated to a weight distribution that produced no sound against the composite — not silence by accident but silence by design, the product of refinement across a data set of surfaces and temperatures it had already mapped. Its sensor array swept the room in a continuous low arc.

  Heat signatures: seven biological. One non-biological, elevated thermal output — the device in the sleeping male's lap, the one that produced interference. Flagged. Distance maintained.

  The large male near the drainage channels — respiratory rate nominal, muscle tension reduced, high-caloric deficit visible in thermal output. Resource-depleted. Non-priority.

  The young male against the wall — rib injury, thermal bloom at the right lateral, sleep shallow. Useful fragility. Logged.

  The older male with the device — not fully asleep. Logged.

  The young male near the leader's position — sleep deep, positioning deliberate even in unconsciousness, body oriented toward the leader's heat signature. Bond strength: high. Flagged for leverage modelling.

  The female — sleep light, one hand near her weapon, clear sightlines maintained to three other signatures. Logged.

  The compromised male — thread active at reduced frequency. Sleep affecting suppression. The thread's warmth was readable from this distance as a faint amber bloom at the left arm's terminus, pulsing at intervals that suggested the system's signal present beneath the surface, waiting for the waking mind to stop overriding it. Patient. It could wait.

  The leader — awake. Thermal output steady. Gaze pattern consistent with threat monitoring. Variable.

  The drone completed its first circuit and began its second.

  It passed the drain channel on its return arc.

  The animal was not where it had been.

  The drone's sensors swept the room in a full three-sixty.

  Found nothing.

  Recalibrated.

  Found nothing.

  Jake's jaws closed from directly above.

  The crunch was brief and complete — the sound of precision engineering meeting something that had not been factored into its tolerance calculations. One leg kicked twice in pure mechanical reflex. Then stopped.

  Jake set the remains on the composite with the careful deliberateness of a dog that had completed a task to his own satisfaction. He sniffed it. Confirmed. Returned to his position beside Don, took the extra second before lowering himself — a body that had been used hard across eleven years, carrying it honestly in the pause before the floor — and closed his eyes.

  The vent sealed itself above the drain channels with the same silence it had opened with.

  In the dark, the room continued breathing.

  Griff heard the crunch.

  He looked at Jake. Jake's eyes were already closed, the drone's remains beside his forepaw, one leg still twitching its last mechanical argument against the dark. The grey at his muzzle caught the lamp's low reach — faint, honest, the face of a dog who had done something useful and considered the matter thoroughly closed.

  Griff fought the smile for roughly one second.

  Lost.

  He picked up his rifle and watched the rest of the dark.

  Seven people. Still here. Still choosing.

  He let himself have that for a moment. Just a moment.

  Mad was the one who found the drone remains in the morning.

  He crouched over it for a long moment, studying the crushed casing, the six articulated legs, the sensor array that had been precision-engineered and was now in three pieces.

  He looked at Jake.

  Jake looked back at him with the expression of a dog that had done something in the night and considered the matter closed.

  "Did you eat any of it?" Mad asked.

  Jake's tail moved.

  "Right," Mad said. He straightened up, looked at the ceiling, found no vent, looked back at the remains. "Right."

  He picked it up and turned it in his hands with the focused attention of a man who had spent his life making things and understood what he was looking at. He examined each of the six legs in sequence, ran a thumbnail along the joint articulation, checked the sensor housing with his thumb. He didn't rush. The formation was still waking around him — Scarab rubbing his face, Archie sitting carefully upright with his hand moving automatically to his ribs before he caught himself, Valley already running the phase rig's morning calibration, Don awake and quiet, his arm held loosely at his side, the bandage showing no warmth in the cold.

  "Six legs," Mad said. "Thermal sensors. Weight distribution optimised for silence." He set it down carefully, the way you set down something you respect even if you don't like it. "It's been in here before. Not this unit. But something like it. The vent modification is years old." He looked at Griff. "We've been watched while we slept."

  "Yes," Griff said.

  "How long?"

  "Long enough to build the model it needed."

  Archie had been looking at the drone's remains from across the room with the focused attention of someone waiting for their turn. He stood, crossed, and crouched beside it. "The joint articulation on the leg assembly," he said. "That's a passive load-distribution system — whoever engineered it understood that noise isn't about weight, it's about how weight transfers between contact points. If you distribute the load across the full leg rather than concentrating it at the foot you eliminate the micro-vibrations that—"

  "It's broken," Mad said.

  "I know it's broken, I'm noting that before Jake broke it the engineering was genuinely—"

  "Jake broke it."

  "Yes. Correctly. I'm saying the thing he correctly broke was well made."

  Mad looked at him for a moment. "You're complimenting the thing that was watching us sleep."

  Archie opened his mouth. Closed it. "Structurally, yes."

  Silence from Mad.

  "The vent," Archie said, after a moment, looking up at the ceiling. "Jake was looking at that vent last night. I noticed him looking at it and I thought — he's looking at the drain channel, something in the drainage system. But he wasn't looking at the drain." He looked at the drone. Then at Jake. "That's the second time. On level four there was a junction seam he wouldn't move past until Griff checked it. That was something too, wasn't it."

  "Keep that thought," Griff said.

  Archie looked at him. "Which part?"

  "The part where you notice what Jake notices."

  Archie looked at Jake. Jake was sitting very still, observing the ration distribution with the patient dignity of an animal who had already made his plans for the morning and was simply waiting for the relevant conditions to align.

  Elin handed round the morning rations. Don accepted his and ate standing. Kyle checked the wall seams out of habit — dark, dormant. Valley completed his calibration and reported no change in baseline output. Griff reached for his pack and found the front pocket slightly lighter than it should have been.

  He looked at Jake.

  Jake was looking at the middle distance with the serene detachment of a dog who found the implication mildly offensive and had no idea what Griff was looking at him for.

  The dried protein strip was gone. This was not a mystery.

  Griff ate what remained of his ration without comment. Jake's tail moved — slow, continuous, the arc of an animal entirely at peace with the morning's transactions.

  "Fifty," Archie said, at the door. He said it the way Andrea had said her numbers — not an announcement, just a fact he was putting into the air, something that needed to exist outside him before they moved.

  The formation answered without needing to discuss it.

  "Fifty."

  And they went back into the Hollow.

  Behind them the room returned to its cold and its quiet. The vent above the drain channels remained sealed. In the system's architecture a small gap appeared in the observational record — six minutes and forty seconds of no data, beginning at the moment the drone's signal had cut and ending at the moment the formation had woken.

  The system logged the gap.

  Revised its asset deployment model.

  And noted, for the first time, that the animal was not a variable it could plan around.

  Only one.