The Stiffening Suits

How many seconds of free fall did two hundred meters of empty canyon air buy before the jagged shale of the riverbed crushed a human skull? Riosbh counted three and a half in her head, her breath whistling raggedly through the calfskin flutter valve of her rebreather as she forced her right boot past the threshold of Station One's outer airlock onto the bare steel flange of the transit rail. She needed her pulse under one hundred and ten beats per minute to keep from fogging the thick quartz viewing strip across her brow, but the wind howling down the Spiral culvert tore at her vulcanized canvas shoulders with forty pounds of lateral thrust.

"Left foot down first," Colmhaign's voice came through the acoustic conduction tube pinned to the collar of her suit, flat and stripped of resonance by the dense exterior atmosphere. "Plant the heel spike into the flange recess. Do not drag the sole."

Riosbh set her boot into the rusted groove. The iron teeth bit with a dull, grinding screech.

Below her, the floor of the world simply ceased to exist.

The culvert was a two-hundred-meter-deep fracture in the basalt shelf, spanning the distance between Station One's lower buttress and the sheer rock spine where Station Two clung eight kilometers to the east. At the center of the span, two parallel heavy-gauge transit rails—originally engineered for automated freight sleds that hadn't run in sixteen months—hung suspended over the mist. A single braided steel safety cable ran waist-high along the northern rail, anchored to iron stanchions every ten meters.

The air out here was not empty. It possessed the greasy, sulfurous weight of a rising Breath-Tide. Amber and ochre clouds of micro-spores drifted in thick, undulating ribbons through the gorge, illuminated from above by the pale ochre wash of the shifting noon. Through the heavy quartz viewport of her hood, Riosbh could see the spores settling like powdered pollen against the rusted rivets and weathered zinc plate of the rail superstructure.

Behind her, the heavy brass hatch of Station One slammed shut, its locking dogs engaging with a solid, mechanical thud.

"Air seal on One is broken," Murchadh's voice rasped through the speaking tube, dry and wind-scoured. He clipped his heavy forged carabiner to the safety cable behind Riosbh. "Lower vents are already sucking slurry. We have whatever is in our back tanks and whatever is left in our marrow."

"We keep ten paces between harnesses," Colmhaign said from the front. He stood on the narrow girder with his knees slightly bent, his canvas rucksack balanced across his broad shoulders as though he were walking a marked loading dock rather than an unshielded twelve-inch iron beam suspended over nothing. "Keep your eyes on the rail head in front of your feet. If you look down at the shale, your inner ear will lie to you about your vertical axis."

"I am aware of vestibular distortion, Colmhaign," Riosbh muttered through the brass mouthpiece, her knuckles white inside the stiffened canvas mittens as she slid her carabiner along the guide line.

"Knowing the name of a reflex doesn't keep you from tilting into the canyon," Colmhaign answered without turning around. "Step."

They moved out onto the span.

The first five hundred meters were a test of rhythmic endurance. The vulcanized canvas of their suits was heavy, stiff with multiple coats of linseed oil and mineral sealants, smelling pungently of boiled resin and cured rubber. Every movement required active muscular force; the fabric resisted bending at the knees and elbows, creating a persistent, dull ache in Riosbh's quadriceps. Inside the hood, the humid heat of her own respiration gathered along the leather neck-seal.

Every ten seconds, Riosbh forced herself to take two long, measured inhalations, timing them against the wet thwack-thwack of the calfskin flap inside the brass canister on her chest. The leather diaphragm, scavenged from Murchadh's spare parts locker and conditioned with mutton tallow, fluttered reliably. It was crude, entirely mechanical, and free of the synthetic polymers that the active Breath-Tide was even now digesting inside Station One's abandoned corridors.

To their right, the canyon opened into a vast, terrifying panorama. The Breath-Tide was rolling up from the lowlands like a biological tidal wave, a dense wall of russet fog that swallowed the distant basalt towers one by one. Where the fog touched the old synthetic transmission relays mounted on the canyon walls, Riosbh could see the dark, cascading smears of dissolving plastic running down the rock faces like black grease.

"Look at that junction box on Stanchion Fourteen," Murchadh called out from the rear. "Synthetic insulation is turning to soup. Two hours from now, the whole high-voltage line will drop into the creek."

"Focus on your footsteps, Murchadh," Colmhaign ordered.

"I am focusing, deserter," the mechanic grunted, his boots ringing rhythmically on the iron flange. "I'm just noting that corporate's ninety-year infrastructure guarantee is currently liquefying at two centimeters per minute. I'd ask for a refund if the billing office wasn't sixty light-years away."

Riosbh did not join the banter. Her attention was locked on the small brass pressure gauge mounted on the left forearm of her suit. The needle hovered steadily at ninety-two kilopascals—a three-kilopascal positive pressure over the dense ambient air of the culvert. That tiny pressure differential was the only thing preventing the aggressive Vaeluigh spore load outside from forcing its way past the stitched seams and collar seals.

They reached the four-kilometer marker—a massive reinforced concrete pylon anchored into a solitary needle of basalt that rose from the canyon floor.

Colmhaign signaled a halt by raising his right fist. He hooked his secondary lanyard around the pylon's iron rung and turned to face them.

"Five minutes to clear moisture from the rebreather traps," Colmhaign said. "Check your tether pins and inspect each other's suit seams."

Riosbh leaned her back against the rough concrete of the pylon, grateful for the momentary cessation of the wind's buffeting. Her legs trembled with the accumulated strain of balancing on the narrow steel flange. She reached down with her right hand to open the brass petcock on her moisture trap, venting a small squirt of warm condensation onto the rusted steel.

When she went to draw her left hand up to check the neck-seal buckle, her left arm refused to bend.

Riosbh frowned inside her hood. She flexed her bicep harder, pulling against the stiff fabric. The canvas gave a tight, dry creak, but the elbow hinge remained locked at an obtuse angle of roughly one hundred and forty degrees.

"Murchadh," she said, her voice tightening. "My left sleeve. Check the flex-bellows at the elbow."

The mechanic shuffled along the girder, keeping his center of gravity low, and squinted at her arm through his quartz visor.

"Looks clean from the outside," Murchadh said. "A little dust accumulation along the seam-tape, but no tears."

"It's not tearing," Riosbh said, her pulse suddenly hammering against her temples, rattling the flutter valve in her canister. "It isn't flexing. The joint is completely rigid."

Colmhaign stepped over the safety line, closing the distance between them in two economical strides. He seized Riosbh's left forearm with his leather-gloved hand and applied steady upward pressure.

The canvas did not yield. Instead, a faint, brittle cracking sound echoed through the sleeve, like dried glue snapping between sheets of cardboard.

"Stop!" Riosbh gasped. "Don't force it! You'll crack the interior bladder!"

Colmhaign instantly released his grip. His pale gray eyes scrutinized the sleeve through the dual quartz ports. He pulled a small bronze utility pick from his belt kit and gently scraped at the seam where the upper arm canvas met the elbow gusset.

A flake of dark, amber-tinted crust came away on the tip of the pick. Underneath, the olive-drab canvas had turned a pale, chalky gray, and the weave appeared swollen, bloated to twice its normal thickness.

"It's not external encrustation," Colmhaign said quietly. "The reaction is inside the fibers."

"How is that possible?" Murchadh demanded, leaning closer. "These suits are pure vulcanized canvas! Natural rubber, cured with sulfur and zinc oxide, layered over unbleached cotton duck! There isn't an ounce of synthetic resin in the entire rig!"

Riosbh forced her breathing to slow down, fighting back the rising tide of cold terror that threatened to lock her throat. She closed her eyes for two seconds, retreating into the precise, orderly taxonomies of her laboratory training.

Zinc oxide.

"The curing agent," Riosbh whispered, her voice shaking as the realization crystallized in her mind. "The vintage spec sheets from the manufacturer... they didn't just use elemental sulfur to vulcanize the heavy canvas for industrial export. They added two percent zinc oxide as an accelerator to speed up the heat-setting process."

"What does zinc do to the spores?" Colmhaign asked, his pick hovering motionless above her arm.

"The Vaeluigh organism uses zinc metalloproteases to break down inorganic minerals," Riosbh said, the words tumbling out in a rapid, analytical stream. "When the Breath-Tide's ambient spore secretions come into contact with trace zinc oxide under humidity, it doesn't digest the rubber—it uses the zinc ions as an enzymatic catalyst! It's cross-linking the rubber's polyisoprene chains with crystalline calcified silicates!"

"Speak plain, girl," Murchadh rasped. "Is it eating the suit or not?"

"It is turning the flexible rubber into a solid mineral block," Riosbh said, her voice rising in pitch. "The canvas isn't rotting—it is petrifying from the outside in! And once the crystal lattice penetrates through the canvas weave to the inner lining, the first time I flex my arm, the brittle crystal will shatter the calfskin air bladder underneath!"

A sudden gust of wind screamed through the truss work of the rail, shaking the pylon and making the safety cable hum like a taut cello string. Riosbh swayed on the girder, her stiffened left arm sticking out awkwardly from her torso, throwing off her center of mass. Colmhaign's hand shot out, his heavy fingers clamping onto her harness ring and locking her firmly against the concrete wall.

"How fast is the cross-linking progressing?" Colmhaign asked, his voice entirely devoid of panic, perfectly level against the roaring wind.

"At this temperature and atmospheric density? The enzymatic cascade is exponential," Riosbh said, staring down at the chalky gray bloom spreading along the forearm. "Ten minutes before it reaches the wrist seal. Fifteen before it reaches the shoulder. Once it hits the torso canvas, the suit will become an iron cast. I won't be able to expand my ribcage to breathe."