Maintenance corridor three was never meant for people in full combat armor.

  The ceiling pressed low. Pipes and cable bundles ran along both sides, sweating condensation into shallow gutters. The air was hotter here, thick with oil, rust, and something metallic that did not belong. Emergency strips along the walls were dimmer; some flickered, others were dead.

  Helios Three moved in a single file.

  Park led, rifle raised, light on, beam cutting a sharp cone through the gloom. Vega followed close behind. Ito came next, sensor rig humming softly. Watson and the rest trailed, turning occasionally to watch their back trail.

  "Watch the footing," Vega said quietly. "Water plus god knows what else on this floor. I do not want anyone kissing the deck face-first."

  "Floor samples look bad," Ito added. "Elevated heavy metals, trace corrosives, and some organics that do not match the colony's original biosurvey. Perfect place for a picnic."

  "Which is why we are leaving our helmets on," Vega said.

  They passed a junction where a smaller duct intersected the main corridor. Someone had welded a crude plate over the opening from the inside. The metal was bubbled and blackened where too much heat had been used.

  "Somebody really did not want anything coming through there," Watson muttered.

  "Or going," Park said.

  "Mark it," Vega said.

  Ito dropped another beacon. Its tiny light pulsed on their HUDs, a blue star in the web of their local map.

  "The emergency ladder shaft is fifty meters ahead," Ito reported. "The main power conduit runs parallel. If we are lucky, the shaft will still be intact."

  "If we are not?" Vega asked.

  "Then we start cutting new holes," Ito said.

  The corridor took a slow curve and opened into a broader chamber.

  Banks of transformers and junction boxes lined the walls, humming and crackling with suppressed power. Thick cables, as wide as Vega's thigh, descended through the floor plating in bundles, vanishing into the dark below.

  At the center of the room, a circular hatch stood open in the deck.

  The ladder shaft.

  A faint, pale light seeped up from it, not the harsh red of emergency strips but something softer that made Vega's skin crawl even before she stepped closer.

  "Lights off," she said.

  One by one, weapon lamps snapped dark. The room plunged into murky shadow, lit only by a few ceiling strips and the glow from below.

  "Look at that," Watson whispered.

  Vega stepped to the lip of the shaft and looked down.

  The shaft dropped straight into rock, its inner wall lined with metal rungs and utility conduits. That much was standard. What was not standard was the thing attached to those walls.

  It looked like a growth.

  Thick, vein-like structures clung to the shaft's interior, winding between pipes and ladder rails. Their surfaces were semi-translucent, shot through with slow pulses of pale green and blue light that traveled along them like currents. Smaller tendrils branched off, encircling individual cables and clamping to them with swollen nodes that pulsed in time with the deeper thrum Vega had been feeling.

  The light bathed the shaft in a ghostly glow.

  "Organic mass is integrating with the power system," Ito said quietly. "It is using the conduits like a skeleton. I am reading active energy transfer along those… veins."

  "Is it alive?" Watson asked.

  "Define alive," Ito said. "It is moving energy, it is growing, and it is interacting with its environment. That is three out of three for me."

  "How far down does it go?" Vega asked.

  Ito leaned in, scanner extended, careful not to let it touch anything. "Far," he said. "Readings drop off beyond seventy meters, but that is my gear, not the growth. Whatever this is, it is not a patch. It is a whole layer."

  Park drew a slow breath through her filters. "We saw something like this at the edge of the mines on Draconis Three," she said quietly. "Not this big. Not this… wired in. But the first strands looked like that."

  "What happened on Draconis Three?" Watson asked.

  "We burned it," Park said. "From orbit."

  There was no emotion in her voice. That was what made Vega's neck prickle.

  Vega keyed the local net. "Recorders on," she said. "We are going down. I want everything we see saved three ways, in case we do not get another chance to describe it."

  She leaned over the shaft, watching the glow, listening to the slow pulse.

  "We go single file," she said. "Three-point contact on the ladder. Do not touch the growth if you can help it. If you do by accident and your suit readings spike, you say so immediately."

  "And if it moves toward us?" Watson asked.

  "We cut it," Vega said. "Then we see if it bleeds."

  Park slung her rifle across her back, stepped onto the first rung, and began to descend.

  The ladder vibrated faintly under her weight. Light from the growth painted her armor in shifting green and blue. Vega watched a vein-like strand flex a fraction of an inch from Park's shoulder, then settle when it found no purchase.

  "Feels like a throat," Park said calmly over the channel. "Full of lights."

  "Keep going," Vega said.

  When Park was ten meters down, Vega followed.

  The rungs were slick. Her gauntlets gripped anyway, servos compensating for the lack of friction. The air grew warmer as she descended, the throb in the shaft louder, though no actual sound registered on her meters. It was something her bones felt more than her ears.

  This story has been stolen from Royal Road. If you read it on Amazon, please report it

  Up close, the growth was worse.

  The thicker strands had a faintly fibrous texture under the translucent outer layer, like compressed muscle or plant tissue. The inner lights were not uniform; they flared and dimmed in irregular patterns, as if responding to a distant signal. In places, the growth had merged with the metal of the wall, flowing around and through struts and braces until it was impossible to tell where machine ended and organism began.

  "It is fused into the support structure," Ito said from above. "If you tried to rip it out, you would tear the shaft apart."

  "How reassuring," Watson muttered.

  Meters passed.

  Their altimeters ticked down. Vega forced herself to keep her hands and boots on the rungs, to ignore the narrow bands where the growth had crept too close and left no clean metal. When she had no other choice, she set her foot carefully on a spot where the growth looked thinner, trusting the suit's insulation.

  It squished, just slightly.

  Suit sensors spiked briefly, then recalibrated. A faint residue sparked off her boot, dissolving harmlessly on her armor.

  "Captain?" Ito's voice had a sharp edge.

  "I felt it," she said. "Suit integrity holding. No breach. The material responds to pressure, but it does not seem corrosive at this contact level."

  "Seems," Watson said. "Great word."

  "Keep your hands to the metal," Vega said. "Feet, too, if you can. We did not come all this way to turn into fertilizer."

  At fifty meters, the shaft widened.

  The ladder continued, but now openings punctured the wall: horizontal tunnels branching into the rock. The growth was thicker here, heavy coils bulging like roots through old concrete.

  Park stopped at the first opening and shone her light inside.

  "Service tunnel," she reported. "Or it was. It is almost completely filled."

  Vega descended until she could see.

  The tunnel had indeed been choked almost solid. Strands crossed and recrossed the space, weaving a lattice that looked disturbingly like bone. Faint bioluminescent glow inside painted repeating patterns of shadow on the floor.

  "Something is using this space as scaffolding," Ito said. "It is not random. There is a pattern in how it fills volume."

  "Is there a way through?" Vega asked.

  "Not without cutting half of it out," Park said. "And if we do that, this whole section might collapse."

  "We stay with the spine," Vega said. "Down."

  They climbed past three more choked tunnels, each worse than the last.

  At seventy-eight meters, the air changed.

  It felt thicker, as if some invisible haze had filled it. Vega's filters compensated automatically, scrubbing whatever new compounds were present, but part of her brain still reacted. Her skin prickled under her armor.

  "New readings," Ito said. "Airborne organics. Not viral or bacterial in the conventional sense. More like spores. The suit is filtering them, but there are a lot."

  "Do not break your seals," Vega said.

  "At this density, if we were unarmored, we would already be breathing them," Ito said. "And they would be on every surface we touched."

  "Comforting," Watson said tightly.

  At ninety meters, the shaft ended.

  Vega dropped the last few rungs and landed on solid rock.

  The space they entered was not on any of Ito's maps.

  It was a natural cavern widened and shored up long ago by human hands. Concrete and support beams reinforced the ceiling. Power conduits ran along the walls. Old mining carts sat rusting on dead tracks.

  All of it had been claimed.

  The growth covered almost every surface. Thick mats spread across the floor, rising into ridged mounds and nodules that pulsed with inner light. Veins climbed the walls, wrapped around supports, and plunged into the rock. Hanging structures dangled from the ceiling like long, translucent sacks, each slowly contracting and expanding as if breathing.

  The light was brighter here, enough that Vega did not need artificial illumination. It painted the cavern in shifting hues of green and blue, with occasional flashes of deeper, angry red that moved too quickly to follow.

  The pulse in the air was strongest here, close enough to syncopate with her own heartbeat. For a moment, nausea rolled through her, a vertigo that came from being out of step with the thing around her.

  "Record everything," she said softly.

  Ito's scanners whirred and clicked, straining against the overload.

  "This is not just a parasite," he said. "It is an integrated system. It uses the refinery's power but also generates signals of its own. I am seeing patterns that look like data. Feedback loops. It is processing something."

  "Thinking?" Watson asked.

  "I am not going to call it that yet," Ito said. "But it is not just digesting rock."

  Park's gaze swept the cavern. "Look there," she said. "On the far side."

  Vega followed her line of sight.

  Half-buried in the mat near the opposite wall was a shape that did not belong: the upper half of a large cylindrical tank, industrial gray peeking through where the growth had not yet fully covered it. The tank's access panel hung open, and cables ran from its interior into nearby veins.

  "Biotech lab hardware," Ito said, voice very flat. "That is a growth chamber. High capacity. Designed for long-term organ culture."

  "Illegal for field use," Vega said. "You do not put that into a live colony without a biosafety net that runs all the way to Fleet headquarters."

  "Someone did," Ito said. "And they tied it directly into the main grid."

  Watson shifted his weight, armor creaking quietly. "So are we calling this… whatever it is… a weapon? Or a mistake?"

  "Yes," Park said.

  Vega walked forward, boots sinking slightly into softer areas of the mat. It flexed underfoot, then firmed, as if adjusting to her weight. Suit readings flickered, then stabilized.

  She stopped three meters from the half-buried tank.

  Up close, she could see the manufacturer's stamp on the metal—a name she recognized from Fleet procurement catalogs and other ships. Seeing it here, welded into the core of something that should not exist, made her jaw tighten.

  A small plaque near the access panel had a project code etched into it. Above it, in smaller scratched letters, someone had added a single word.

  VECTAR.

  Vega stared at it.

  "In the control logs," she said slowly, "I saw references to Vectar protocols. I assumed it was a local acronym. Ventilation system, vector analysis. Something dull. This is not dull."

  "Vectar," Ito said. "Vector plus something. Or a name. They named this."

  "They named the thing that ate their colony," Watson said.

  Vega keyed her recorder with a gloved thumb.

  "Refinery sublevel, ninety meters down," she said, keeping her voice steady. "We have visual confirmation of a large-scale biotech construct integrated into Nemea Nine's power and infrastructure. It appears centered on at least one illegal growth chamber labeled Vectar. The construct is emitting complex energy patterns and has physically infiltrated the mine support structures."

  She paused, then added, "This is not an accidental infection. This is an engineered system."

  She closed the channel and looked at Ito.

  "Can we cut it off?" she asked. "From here. Without bringing the ceiling down on our heads."

  Ito did not answer right away.

  He moved around the tank, careful not to touch more of the growth than necessary, scanning bond points, power feeds, and data lines.

  "The growth is using the chamber as a hub," he said at last. "But it is no longer dependent on it. If I kill the hardware, the organism will take a major hit, but it will not die. It has already spread too far. And if I do it clumsily, it may react badly."

  "Define badly," Vega said.

  "Localized chain reaction," Ito said. "Energy feedback. Possible structural failure in the sublevels. We are standing in the middle of its nervous system. If it spasms hard enough, we go with it."

  "Is there a safer way?" Vega asked.

  Ito hesitated. "We could plant charges here and along the spine, then retreat to a safer distance before detonating," he said. "Hit it hard from multiple points. That might slow it enough for orbital support to come in and finish the job."

  "We are cut off from orbit," Park reminded him.

  "Now," Ito said. "But storms move. Jamming fails. If our beacon in control survives, Taggart or Szeto will have enough to know something went very wrong. They will be looking for where to drop the hammer. If we can mark the spinal center with a big enough explosion, it will show up on their sensors."

  Vega thought of the miners who had left the warning on the wall. Of the dead in the plaza. Of the silent habitats above.

  "Can we rig something that big with what we brought?" she asked.

  Ito's eyes moved as he ran through inventory lists. "If we combine squad explosives and the shuttle's reserve yields, maybe," he said. "It will not be elegant, but it will be loud."

  "Then that is our play," Vega said. "We mark the heart, we blow it, we fight our way back up, and we pray the storm clears enough for orbit to see the fire."

  "And if the organism does not like being poked?" Watson asked.

  Vega looked past him, deeper into the cavern.

  In the far shadows, something shifted.

  For a moment, she thought it was just the growth, pulsing in its slow rhythm. Then a shape detached itself from the wall, unfolding with a deliberate, sinuous motion.

  It was large.

  It moved on multiple jointed limbs that clicked softly against the rock. Its body was long and segmented, covered in overlapping plates of something that looked like translucent armor, lit from within by faint green lines. At its rear, a thick tail arched up and forward, ending in a cluster of barbed darts that glistened with a dim, wet shine.

  Its head, if that was the right word, turned toward them.

  Multiple glittering eyes regarded the intruders. Mandible-like structures flexed once, twice.

  A Vectar.

  Vega brought her rifle up without thinking.

  "Contact," she said, voice flat. "Eyes on."