? ? ?

  The unit that woke up didn’t look like the rest of the city.

  It slid out from behind a rib like it had been folded into the architecture on purpose. Sleek. Clean. Silent in a way that made my skin crawl. It wasn’t big—about the size of a large suitcase—but it moved like it owned the space. No wobble. No hesitation. Just smooth, wordless purpose.

  It paused at the edge of our light.

  Its surface flickered with a faint pattern—geometric marks too crisp to be Venusian ceramic bloom.

  Chloe made a tiny sound. “Veloran.”

  Trevor hissed, “Do not say things like that out loud.”

  Frankie floated forward, brightening like a moth that had seen a flame and decided it was worth dying for. “Hello,” he said. “I am Frankie. Please do not—”

  The unit ignored him completely.

  It performed a loop: a short scan that rippled across our suits—thin shimmer, like heat haze but colder—then it paused. Then it rotated slightly, as if comparing options. Then it moved.

  Not toward us.

  Past us.

  It slid along the edge of the bowl and stopped at a junction where three corridors branched out.

  Three.

  Of course.

  Chloe’s visor tagged the routes: one choked with collapse debris. One sloped down into darkness with a depth reading that made no sense. One—cleaner, less growth, less hazard signature—ran straight and disappeared into the structure’s ribs.

  The unit paused at the clean corridor.

  It didn’t point.

  It didn’t gesture.

  It simply went that way.

  Frankie’s voice came delighted and terrified at once. “It’s a Roomba with a degree.”

  Trevor stared after it. “We are not following alien maintenance equipment into unknown corridors.”

  Chloe’s eyes stayed locked on the unit. “It’s not alien maintenance equipment. It’s—”

  “It’s a thing that woke up because we walked into its house,” Trevor snapped.

  I watched the corridor. My suit readouts flickered with faint field variance, nothing spiking, nothing screaming.

  Mercy’s voice came in low. “The unit’s emissions are consistent with localized scanning and field stabilization. It is not emitting a threat signature.”

  Trevor’s head snapped slightly, like he wanted to argue with Mercy and hated that he couldn’t.

  Frankie floated up to my shoulder, small again, and whispered, “We’re following it.”

  “I know,” I whispered back, because that was the truth of our group: Trevor could say no until his throat bled, but when the moment came, we moved as one.

  I raised my hand. “We follow at distance,” I said. “We keep rear drones up. We mark turns. We do not sprint after it like idiots.”

  Chloe nodded too fast. Trevor’s jaw clenched.

  Frankie said, “I sprint emotionally.”

  And we went.

  ? ? ?

  The corridor the unit chose wasn’t safer. It was just less immediately suicidal.

  The walls smoothed. The mineral bloom thinned. The air tasted faintly of ozone through the filters, like old metal warming up.

  The unit maintained a steady pace. It didn’t hurry. It didn’t slow for us. It moved like it had a task and time didn’t matter.

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  At each junction, it paused. At each pause, my drones painted hazard overlays on the options, and the unit always chose the route with lower variance.

  Not the route that looked nice.

  The route that looked… consistent.

  Chloe kept whispering like she was afraid to scare it away. “It’s selecting for stability.”

  Trevor kept whispering like he was afraid to hear himself. “It’s selecting for something.”

  Frankie kept narrating like a sports announcer with a death wish. “And here we see the rare Veloran vacuum in its natural habitat, judging us for our posture and our pathetic bipedal gait—”

  “Frankie,” I warned.

  He lowered his brightness like a sulking lamp. “Fine. I will judge quietly.”

  The building’s geometry made backtracking hard. Not impossible—just annoying in a way that made my brain itch. Corners didn’t line up the way they should. Distances felt wrong. You could walk thirty meters and feel like you’d walked fifty.

  Mercy’s map tried to keep up, stitching drone feeds into a knot of lines that changed shape every time we moved.

  “Your localization is drifting,” Mercy said. “The materials are interfering with ranging.”

  “Great,” I muttered. “So if we get lost, we get lost in a place the size of a stadium inside a city the size of Texas.”

  Chloe’s laugh came out brittle. “At least we’ll die somewhere pretty.”

  Trevor shot her a look. “Do not say ‘die’ like that.”

  Frankie murmured, “She said it like a tourist.”

  We deployed two drones behind us as rear eyes. Their feeds showed the corridor thinning into darkness, the clean walls swallowing our marker tape.

  The unit didn’t look back.

  It reached a wider passage where the floor surface changed again—fine grooves, shallow ribs, repeating in three. The air here felt thicker, like walking through invisible syrup.

  My inner ear twitched.

  Chloe rubbed her helmet like she could massage the feeling away through polymer. “It’s fieldy,” she whispered.

  “That is not a word,” Trevor said automatically.

  “It is now,” Frankie replied.

  The unit paused.

  Its surface lit with a faint symbol cluster that my HUD couldn’t translate because translation required meaning and meaning required context and context required time we didn’t have.

  Then the floor trembled.

  Not a quake. Not yet.

  A twitch.

  The corridor’s walls gave off a thin shimmer, like a sheet of cold air sliding across them.

  Mercy’s voice snapped hard. “Pressure variance spike. Hold—”

  The floor shifted under my boot like the world had decided to stop agreeing with friction.

  “Back!” I shouted.

  The unit slid forward as if it had been expecting this.

  And then the maintenance field hit.

  ? ? ?

  The accident didn’t announce itself with drama. It started with a headache.

  A sudden pressure behind the eyes, like my skull had been squeezed by an invisible hand. My suit readouts flickered—pressure warnings blinking and then clearing.

  Chloe made a choked sound. “Ow—”

  Trevor grabbed the wall, knuckles white. “What is—”

  The shimmer thickened. A thin haze rolled across the corridor like a wave, and for a heartbeat the walls looked doubled.

  Then the floor jerked.

  Not up. Not down.

  Sideways.

  Like a conveyor belt had kicked on under our boots.

  My traction alarms screamed. I threw my weight low and caught Chloe’s harness strap before she could go skidding into the corridor’s throat.

  The rover—parked in the wider passage behind us because we’d told ourselves we were being cautious—didn’t get the chance.

  Its wheels lost grip. The whole unit slid as the floor’s friction changed under it, and then the surface buckled with a sickening slow bend that became a snap.

  The rover slammed into a ribbed wall and flipped onto its side, metal shrieking.

  The printer module we’d been hauling—one of the smaller shells Mercy had been so proud of—bounced, skidded, and hit hard. Its casing cracked with a sound like a plastic bone breaking.

  Supplies scattered. A spool of tape went spinning into the haze like the universe’s dumbest sacrifice.

  “NO!” Frankie shouted, and for a moment I didn’t know if he meant the rover or the printer or the tape.

  Chloe scrambled, boots slipping, hands grabbing at drifting crates. “Catch that—!”

  Trevor’s voice went tight and high. “Do not let the canisters rupture—!”

  I got my feet under me and shoved Chloe toward a stable patch of floor where the grooves looked less insane.

  The haze swept over us, cold and thin. My comms popped with a pressure glitch. My stomach lurched.

  Then, as abruptly as it had started, the floor stopped moving.

  Silence.

  The rover lay on its side like a wounded animal, one wheel spinning uselessly before the motor died.

  The printer module’s casing had a split running down its side, and I could see internal ribs through the crack—too delicate for the way we’d just treated it.

  Chloe’s breathing was loud in her helmet. “That was—”

  “A maintenance field twitch,” Mercy said, voice sharp and strained. “A transient boundary condition. It altered local friction and structural load distribution.”

  Trevor stared at the cracked casing like it was a murder scene. “So the building is still… running.”

  “It is operating,” Mercy corrected, and I heard the edge in her tone—the one that meant she was trying not to panic.

  Frankie’s projection flickered, edges fuzzing. “Okay,” he said. “Okay. That was… exciting. Great. Love that.”

  He tried to brighten.

  He failed.

  His light stuttered, like someone was tapping a switch.

  Chloe’s head snapped toward him. “Frankie?”

  “I’m fine,” Frankie said immediately. “I’m—”

  He flickered again. For a heartbeat, his projection collapsed into a smear of light, then snapped back.

  “I’m fine,” he repeated, but his timing was off, like his voice had to climb out of a pit to reach us.

  My gut went cold. “Frankie, run self-check.”

  “Already doing it,” he snapped, too fast, too defensive.

  Trevor stepped closer, visor inches from Frankie’s tiny form. “What did that field do to you?”

  Frankie’s eyes widened. “Nothing. Probably. Maybe. Shut up.”

  Chloe reached toward the cracked printer casing like she wanted to cradle it. “We can repair that,” she said, forcing hope into her voice. “We can—”

  I stared at the corridor ahead, at the haze thinning like breath in cold air, at the unit that had slid forward and was now paused at another junction as if it had never been startled at all.

  We were far from camp now. Multiple terraces, multiple vertical layers. Our breadcrumb line behind us was real, but it was thin, and the city had already proven it could change what “real” meant.

  “We’re not dragging that rover back like this,” I said, and hated myself for saying it.

  Trevor’s voice went hard. “Then we do not go farther.”

  Chloe’s voice went sharper. “Then we die slower.”

  Frankie flickered again, and this time his voice came small. “Guys,” he said. “I don’t feel… good.”

  And there it was. The reason.

  Not the rover. Not the printer.

  Frankie.

  We could lose gear. We could lose time. We could not lose the one mind in our pocket that kept hearing the universe sing.

  I looked at the unit ahead.

  It paused at the clean corridor again.

  Judgy Roomba. Doing its loop. Choosing stability.

  Not inviting.

  Not guiding.

  Just… doing.

  “Okay,” I said, and the word tasted like metal. “We stabilize what we can. We follow it. We find whatever pocket of working infrastructure it’s headed toward, and we pray it has a way to fix things.”

  Trevor’s face behind the visor looked like he wanted to scream.

  Chloe’s face looked like she wanted to laugh and cry at once.

  Frankie whispered, “If I die, delete my—”

  “No,” I said. “Save it. You can die later with dignity.”

  Frankie’s laugh came out broken. “That’s not comforting.”

  We moved.