The Cold Dissolution

A plasma torch would have severed the frozen weld in thirty seconds, but the thermal flare would have lit up Sector Four's telemetry board like a distress flare. Levmir had twenty-eight minutes of latent capacity remaining in his paraffin heat sink before his suit fans began circulating his own boiling sweat. He could not afford heat, and he could not afford noise.

He braced his magnetic boots against the conduit collar and unslung his utility harness.

"Three decades of cooperative steel," Levmir muttered under his breath, "held together by pride and slag."

From his lower leg pouch, he pulled a coil of magnetic elastomer channel. In zero gravity, uncontained liquid would separate into surface-tension beads, float off the surface, and coat his faceplate or foul his thruster nozzles. Levmir unrolled the flexible black strip along the oval perimeter of the hatch, pressing its magnetized edges flush against the hull plates on either side of the jagged weld. The flexible silicone lip created an airtight, four-millimeter trough directly over the hardened bead of metal.

Next came the reagent. He unclipped a reinforced fluoropolymer bladder filled with dark, amber-tinted gel.

The fluid was not an industrial solvent from the station’s engineering stores, where every milliliter was weighed and recorded by Kordov’s inventory clerks. It was concentrated carboxylic-thiol bio-slurry, a raw secondary metabolite harvested from the bottom sludge of Mash Vat Seven. When Spirka-yeast metabolized raw asteroid pyrites, it stripped sulfur and nickel to build cellular membranes, concentrating organic chelating acids that devoured structural iron at room temperature. It did not melt metal with heat; it unbound the atomic lattice cold.

Levmir connected the bladder nozzle to the gasket's injection port and squeezed the hand pump.

The thick gel flooded the channel, turning pale gray as it made contact with the weathered weld. Through the transparent silicone housing, miniature bubbles of trapped hydrogen began to nucleate along the metal seam. The chemical reaction was entirely endothermic, drawing heat out of the surrounding bulkhead rather than radiating it outward. On his suit's wrist display, the infrared signature remained dead flat, perfectly masked against the ambient chill of the outer rock.

Levmir attached a passive charcoal scavenger pad over the gasket's relief valve to catch the trace sulfur gas. If a ventilation sensor downstream caught a single part per million of mercaptans, an automatic quarantine sweep would lock down the entire conduit.

He watched his digital chronometer tick down.

Twelve minutes passed in silence. Around him, the deep structural bones of Zhelezkova groaned as the station rotated through its slow stabilization cycle.

At fourteen minutes, the gray slurry turned into a crumbly, blackened paste. The hard iron-nickel crystalline structure of the plasma weld had degraded into brittle organometallic salts.

Levmir peeled back the magnetic rubber dams, folding them carefully and stowing them in his chemical waste bag. What remained on the hatch seam looked like charred charcoal briquettes, tracing the outline of the door.

He took up his heavy beryllium-copper pry bar from his tether. Unlike standard steel tools, the copper alloy would not spark against the station hull. Levmir wedged the tapered chisel tip into the softened seam, braced his shoulder against the conduit frame, and drove his heels into the magnetic deck.

He leaned all eighty kilograms of his suited mass into the lever.

The blackened crust sheared with a muffled, grinding snap. Vibrations traveled up the shaft of the pry bar directly through his glove gauntlets and into his collarbones, but no airborne shockwave carried through the thin air of the unpressurized conduit.

Levmir reset the bar two handspans lower and wrenched again.

A four-foot section of the degraded weld parted cleanly from the frame, falling away in a shower of dry, oxidized flakes that drifted lazily in the microgravity. Levmir grabbed the hatch's central manual locking wheel, planted both boots, and hauled backward.

The heavy circular dogs inside the door mechanism protested, grinding through layers of fifty-year-old dried grease, before finally retracting into their housings. With a hollow thump, the oval bulkhead swung outward on its massive cantilever hinges.

A faint puff of ancient, stagnant atmosphere escaped from the breach, instantly crystallizing into a brief cloud of glittering ice needles in the vacuum.

Levmir gripped the hatch rim and peered into the void beyond.

The space was not a maintenance conduit. It was a massive, unlit plenum chamber—the primary collection manifold that fed raw heat from the station's central industrial core into the outer radiator arrays. Giant beryllium heat pipes, each three meters in diameter, stretched across the darkness like the ribcage of an ancient leviathan.

He reached for his suit’s floodlight, then checked the analog dosimeter pinned to his left lapel.

The mechanical needle was already trembling away from zero. A steady, dry chatter began to click inside his helmet audio feed: thirty millisieverts per hour, climbing sharply as the unshielded geometry of the core pipe came into line of sight.

Levmir looked back down the dark conduit toward the relative safety of the lower brewery. His paraffin heat sink had fourteen minutes of cooling left. The radiation would poison his marrow if he lingered, but the answers to Vat Seven’s death lay deeper inside the hot zone.

He locked his tether onto the hatch frame, lowered his gold-tinted visor to cut the scatter, and hauled himself through the opening.