Structures in the Dark

The metallic crunch from sublevel one faded into a low, dry groan that set the loose spanners chattering against the aluminum workbench.

Colmhaign kept his palm flat against the cold steel of the floor until the vibration died in the deck plates. In the corner by the secondary bypass, Riosbh remained frozen on his crate, his face drained of color under the amber glare of the emergency strip. The bypass line they had just clamped into the primary scrubber was holding at ninety-four kilopascals, its copper coils ticking with residual heat, but the structural floor beneath them had dropped three millimeters along the south expansion joint.

Riosbh swallowed, his eyes darting from Colmhaign's belted work lantern toward the sealed hatch at the end of the gangway. "If the lower locks are gone and sublevel one is flooded with external air, the pressure differential will buckle the deck. We have to dog the upper bulkhead and seal the shaft."

"If we dog the hatch without knowing how high the fluid has risen, the back-pressure will punch through the graywater returns and blow the floor out from under your boots," Colmhaign replied. He pulled a pair of heavy vulcanized gauntlets from the locker and tossed a spare respirator onto the crate beside Riosbh. "Stay at this manifold. If the intake pressure needle drops below eighty-five, bleed two liters of nitrogen from reserve tank four. Do not touch the bypass valve. Do not run an automated diagnostic. If you hear someone cycling the shaft interlock from below, you do not open it until you see three green flashes through the inspection quartz."

Riosbh stared at the respirator. "Where are you going?"

"To pull Murchadh out of the pump bay before he does something expensive."

·  ·  ·

The auxiliary corridor smelled of scorched sulfur and damp slate. Halfway down the narrow passage, where the wiring conduits converged toward the central mechanical spine, the lights had failed entirely. A single red beacon rotated slowly above the pressure doors of the primary machine shop, casting long, bleeding shadows across the floor.

Murchadh was already at the manual dogging wheel, a two-meter cheater pipe wedged through the spokes. His coveralls were black with hydraulic grease at the elbows, his graying hair matted with sweat against his forehead. Every line of his back was rigid as he threw his full weight against the leverage bar, trying to force the hardened steel teeth of the lock past their safety stops.

"Get your weight off that bar, Murchadh," Colmhaign said, keeping his voice level as he stepped into the red circle of the beacon.

Murchadh did not let go of the pipe. He jerked around, his breath coming in ragged, whistling rasps. His eyes were bloodshot, narrow with the raw, defensive fury of an engineer who had spent five years keeping a rotting station from falling into the dust only to watch it collapse under someone else's shift.

"The lower sensors are flatlining, Colmhaign," Murchadh spat, wiping his brow with an oily forearm. "The bilge pumps in bay three aren't reporting. The return valves are jammed open. If I don't drop the blast gate now, the tide is going to crawl up the service conduit and eat the main turbines. Get over here and grab the cheater bar, or get out of my way."

"If you drop that blast gate, you seal fifty thousand liters of uncompressed external slurry inside the pipe run," Colmhaign said. He stepped forward and rested a heavy hand on the cold iron of the pipe, pressing downward just enough to counter Murchadh's leverage. "The main turbines are already offline. The communications array surged out ten minutes ago. We have no orbital telemetry, no relief shuttle coming from Ness, and twelve hours of scrubbed air upstairs if the bypass holds."

Murchadh stopped straining against the pipe. He stared at Colmhaign, his chest heaving under his heavy cotton harness. "What did you say about the comms?"

"The step-up transformer burned through," Colmhaign said plainly. "I used the coolant lines and copper coils to jacket the intake manifold. The supervisor class is seventy hours out on high burn toward the inner system. We are the only people within three hundred kilometers of this ridge."

Murchadh's grip on the pipe loosened slightly. For several seconds, the only sound between them was the low, grinding whine of the station's primary frame settling against the bedrock.

"You gutted the transmitter," Murchadh said. The anger in his voice had curdled into a cold, hollow disbelief. "You burned our tether to the fleet to save a twelve-hour air bubble."

"I bought half a day so we could figure out how to walk to Station Two," Colmhaign said. "Now take the cheater pipe off the dogging wheel. We're going down to sublevel one."

"Sublevel one is gone!" Murchadh shouted, gesturing violently at the sealed deck hatch. "The tide breached the lower drainage sluice. The external atmospheric density out there is three point two bars, loaded with spore mass. The moment we crack that hatch, that filth will eat our seals and dissolve our lungs."

"The air in the shaft is dense, but the emergency check-valves at the five-meter landing are mechanical brass," Colmhaign answered. He unslung a heavy canvas field rig from his shoulder and held it out. "Natural vulcanized rubber and waxed canvas. No synthetic polyurethanes, no nylon webbing, no plastic latches for the enzymes to feed on. We go down to the primary drainage vault, inspect the hull breach, and test the load. If the foundation is intact, we know how much time we have to stage gear. If the foundation is collapsing, we abandon Station One within the hour."

Murchadh looked from the canvas rig to Colmhaign's face. His jaw set hard, the muscles jumping beneath his stubble. "You were a deserter in the military, weren't you? That's what the transfer manifest said when they dumped you out here on the Spiral."

"The manifest said what the logistics board needed it to say," Colmhaign said, his voice flat and unyielding. "Put the harness on, Murchadh. Or stay here and watch the floor rot under you."

Murchadh snatched the canvas rig from Colmhaign's grip with a sharp jerk. He pulled the thick straps over his shoulders, his fingers moving with practiced, bitter efficiency over the brass buckles. "If we die down there because your brass valves failed, I'm shoving you through the breach first."

"Fair enough," Colmhaign said. "Remember the flash codes. The air down there is thick enough to swallow words at ten paces. One flash to acknowledge. Two flashes for clear deck. Three flashes to freeze."

·  ·  ·

The vertical service shaft was five meters wide, bored directly through solid gray shale and lined with fluted cast-iron rings.

As Colmhaign lowered himself through the hatchway onto the steel rungs of the ladder, the change in the atmosphere struck him immediately. The air rising from the depths was heavy, damp, and unusually warm, carrying a faint, alkaline stench that tasted like wet limestone and crushed bitter almonds. Every breath felt thick in the throat, pressing against the lungs with a barometric weight that signaled the rising external tide outside the bedrock.

Murchadh followed five rungs above, his heavy boots clanging rhythmically against the iron. Each man carried a sealed carbide work lamp hooked to his belt, casting long, conical pools of pale yellow light down into the darkness.

At the eight-meter mark, the standard electric conduit ended. The junction box had split open; its synthetic insulation had liquefied into black, resinous tears that hung like icicles from the rusted tray. Colmhaign stopped on the rung, lifted his lantern, and signaled once—a single steady beam toward the opposite wall.

Murchadh tapped his spanner against the ladder rail: clack-clack. Acknowledged.

Colmhaign stepped off the bottom rung onto the landing of sublevel one.

The floor here was covered in an inch of murky, viscous condensate that pooled around the drainage grates. The atmospheric pressure inside the vault was noticeably higher than on the upper decks, pressing against Colmhaign's eardrums until he had to swallow hard three times to equalize. In this dense, humid air, the ordinary acoustics of the station were completely ruined. The low hum of the distant turbines sounded like a muffled, aquatic thrumming, while the splash of his boots through the sludge made a dead, wet slap that died within arm's reach.

He unhooked his lantern and swept the beam across the maintenance bay.

Murchadh stepped down beside him, splashing into the muck. He raised his own lamp, and as the yellow light illuminated the far wall, a strangled gasp broke from behind his canvas mask.