The Brass Adapter

I looked down at the canister in my hands. The threads on the intake coupling were slightly larger than the commercial bayonet mounts on our standard masks. The pitch was wrong.

"The coupling won't seat," I said, tapping the brass collar. "The consortium masks use a 40-millimeter thread. These military units use a 42-millimeter locking lug."

"I know," she said. "That’s why I brought you."

She pulled a brass thread-adapter and a roll of vulcanized silicone tape from her pocket and dropped them into my palm.

"Fix it, genius."

The challenge hung between us in the cold, damp air beneath the truck.

I didn't answer with words. I pulled my multi-tool from my belt, flipped out the precision micrometer and the threading reamer, and went to work.

The brass of the adapter was soft enough to take a new lead-in taper if cut carefully. I braced the adapter against the buggy's frame rail, using the vehicle's massive iron mass as a vise. My fingers worked with steady, practiced motions. Measure twice. Cut once. Clear the brass shavings with a burst from the air nozzle.

Orsi didn't leave. She sat on the iron grating beside me, watching my hands work.

"You're fast with a file," she noted.

"My first three years at the Institute were spent in the wet labs repairing third-hand gas chromatography valves," I said, without looking up from the threads. "When your research grant is sixty percent smaller than the geology department's, you learn how to make junk work."

"Sounds like the army."

"The army shoots people who break their equipment. The university just denies their tenure."

"Same result," she muttered. "Slow death by paperwork."

I finished the third adapter, tested the seal against the military canister's intake lug, and torqued it until the silicone gasket seated with a clean, airtight click. I raised the canister to my lips, sealed the intake with my palm, and drew a hard breath.

The vacuum held. Not a whisper of leakage.

"Four functional units," I said, handing two back to her. "That gives us seventy-two man-hours of breathable air in saturated zones."

"Told you," she said.

She reached for the canisters, but as she stretched her arm, the torn fabric of her shirt pulled taut across her collarbone. She suppressed a wince, her jaw tightening for a split second before she masked it.

I caught her wrist.

Her skin was hot against my cold fingers, her pulse steady and firm beneath the tendon. She didn't pull away, but her eyes narrowed with warning.

"What?" she asked.

"You're bleeding through your collar."

"It's a scratch."

"It's a jagged tear over an old scar," I said. "The sulfur in this air contains iron pyrites. If the particulate gets into an open wound, you'll have an intractable bacterial infection before we reach Station Two."

"I've had worse than sulfur."

"I don't care about your past medical history. I care about having a functional guide who isn't delirious with septic fever while steering a six-ton truck down a twenty-degree grade."

She stared at me. For three long seconds, neither of us moved.

"Fine," she said, releasing a short, sharp breath. "Fix the shoulder too."

I crawled out from under the chassis and pulled my medical kit from the rear bin.

We sat on the tailgate of Buggy Three, under the amber glow of the hazard lamps. Margit remained inside the cab, pointedly ignoring us, though I could see her silhouette through the rear glass, occasionally glancing into her side mirror.

I opened the antiseptic tin.

"This will sting," I said.

"Don't warn me," Orsi said. "Just do it."

I pressed the alcohol swab to the laceration above her collarbone.

She didn't flinch. Her only reaction was a slight stiffening of the muscles along her neck, a sudden ridge of tension under the skin. Her collarbone was prominent, framed by the pale, puckered line of the old shrapnel wound. It was an ugly mark, jagged and deep, running from the base of her throat down toward her shoulder joint.

"Artillery?" I asked softly, dabbing away the dried blood.

"Mortar fragment," she said. Her voice had gone quiet, stripped of its usual mocking bite. "Third Division rearguard during the retreat through the Karst Gap."

"That was five years ago."

"Six."

I reached for the butterfly closures. My fingers brushed the curve of her neck as I aligned the adhesive strips. Her skin was warm, contrasting sharply with the freezing mist swirling off the cavern walls. She smelled distinctly of clean soap and gun oil.

It was an irrational observation. A thoroughly unprofessional detail to register in the middle of a hazardous subterranean descent.

"You deserted after the Karst Gap," I said, keeping my hands steady as I secured the bandage.

Orsi didn't look at me. Her gaze was fixed on the black abyss beyond the platform railing.

"The colonel ordered us to blow the tunnel behind us," she said. Her words were clipped, dropped one by one onto the iron deck. "My squad was still carrying forty wounded out of the lower gallery. He told me they were expendable assets. He told me to turn the ignition key."

"What did you do?"

"I smashed the detonator box with a sledgehammer," she said. "Then I dragged six stretcher cases through the drainage culvert on my hands and knees."

She turned her head, looking straight into my eyes. The intensity in her expression was raw, challenging me to judge her.

"The provost called it cowardice under fire," she whispered. "Refusal to obey a tactical demolition order."

I smoothed the edge of the medical tape over her skin. My thumb lingered for half a second against her collarbone before I pulled my hand back and closed the kit.

"A coward runs to save their own skin," I said. "You stayed to pull people out."

Orsi blinked. A momentary crack appeared in her stoic composure, a flicker of surprise that she instantly banished behind a flat smirk.

"Don't get sentimental, Doctor. I still charged them twenty chits a head for the ride."

"A terrible business model," I replied dryly. "You should have charged fifty."

A genuine laugh escaped her—short, rough, and entirely unpolished. It transformed her face for a single heartbeat, softening the hard lines around her mouth.

Before I could say anything else, the high-frequency shortwave receiver mounted on the buggy’s exterior bulkhead burst into life.

Kzzzt... crrrk...

A harsh whistle of static ripped through the cavern, echoing off the wet basalt cliffs.

Orsi was on her feet in an instant, her hand dropping instinctively to the grip of her sidearm. I lunged for the radio console, my heart slamming violently against my ribs.

The radio was tuned to the deep-relay frequency. 433.92 Megahertz. The dedicated channel for Station Four.

Crzzzt... Folyosy... do you read...

The voice was faint, submerged beneath layers of electromagnetic interference and cavern echo, but the cadence was unmistakable.

Dr. Imre Vargha.

My mentor. The man who had taught me how to culture subterranean spore flora thirty years before the consortium ever cared about their pharmaceutical value.

I grabbed the handset, keying the transmitter. "Vargha! This is Lórágy. We are at Shelf One. What is your status?"

Static roared back, churning like white noise over a waterfall. Then, through the hiss, a broken fragment of audio punched through:

...containment seal three failed... spores metastasizing at four hundred meters... do not bring... Margit's drills... they are triggering the...

A deafening pop blew through the speaker, followed by a steady, dead-tone whine.

I clicked the transmitter twice. "Vargha! Repeat! What are the drills triggering?"

Nothing. Only the cold, hollow whistle of the breach.

Behind me, the cab door of Buggy Three swung open. Margit stepped onto the running board, her eyes locked on the smoking radio console.

"What did he say?" Margit demanded, her voice sharp with sudden tension.

I looked at the radio. Then I looked at Orsolyzsa.

Orsi had already slung her rucksack over her uninjured shoulder. She stepped up to the driver's side of the buggy, pulled the door wide, and looked at me.

"Pack your kit, Doctor," she said. "We're going down."