Rewiring the Logic Board

Can you smell scorched bakelite under four inches of brackish river wash?

I dropped through the iron hatch first. My work boots hit the submerged steel grating with a heavy, hollow splash that sent brown foam surging against my shins.

Above me, Morwenna swung her legs over the rim without hesitation. She descended the rungs with an ease born of terrace ladders, her canvas trousers brushing my shoulder before she dropped beside me. The conduit shaft was three feet wide, boxed in by curved plates of cold steel that thrummed like a trapped engine.

"Watch your head on the low-pressure pilot line," I said, shining my brass inspection torch down the shaft.

"I have eyes, Wainwright." She ducked her head, her dark hair pinned back with a brass cotter pin. A faint streak of black graphite grease marked her left jawline. "Where is the junction housing?"

"Forty feet aft, right behind the intake dampener."

The hull plates shuddered beneath our soles. A deep, grinding groan rolled through the iron framing, the sheer hydrostatic head of the estuary shoving against the wedged oak revetment on the trash racks outside. We had thirty minutes before the stanchions sheared off completely.

We waded forward shoulder-to-shoulder, the current tugging at our knees. In a space this narrow, avoidance was impossible. Her wool sleeve dragged against my forearm with every step. Every breath she took sounded loud in the damp echo of the tunnel.

"Authority specs say this shaft should have automatic sump pumps," she remarked, ducking under an insulated cable bundle.

"Authority specs assume the river stays outside where it belongs." I paused at a bulkhead bend, shining the beam on a cast-iron box bolted to the ribbing. "Here. Section Four logic hub."

The heavy brass wing-nuts on the panel were rusted solid. I reached for my insulated pliers, gripping the nearest nut and setting my weight into it. Metal screeched on metal, but the wing-nut refused to budge.

"Let me," Morwenna said. She reached into her tool belt, produced a stubby pry-bar, and wedged the beveled tip under the flange. "On three. You torque, I lever."

"One, two, three."

We pulled together. Her shoulder drove into my bicep, firm and warm against the cold brine dripping from the ceiling. The rusted brass yielded with a sharp crack. We worked the remaining three lugs free in under a minute, stripping the faceplate away to expose the guts of the station's hydraulic brain.

Inside lay an absolute rat's nest of braided cloth wiring, brass terminal bars, and charred isolation relays. The pungent reek of vaporized solder and ozone spilled out into the damp air.

"Dispatch's remote lockout didn't just cut the signal," I observed, inspecting the blackened traces. "The surge blew the primary isolation bridge clean in half."

"Can you bridge it?"

"If I bypass the safety interlocks on the intake solenoid." I drew a spool of six-gauge stranded copper from my hip pouch and clicked my pocket knife open. "I have to cross-wire terminal seven directly into the reverse-pulse bus. But the capacitor bank is still carrying residual charge."

"How much charge?"

"Enough to stop a heart if you ground yourself against the hull."

Morwenna stepped in closer. Her boots pinned my right foot firmly against the grating, steadying us both against the vibrations of the floor plates. She reached out, her bare fingers wrapping around the thick rubberized sleeve of the main jumper lead.

"I'll hold the bus terminal steady," she said. Her voice had dropped to a low, steady register that cut straight through the deafening roar of the intake. "You strip the wire and make the clamp."

Her gaze was locked onto mine, completely devoid of fear. I could feel the heat radiating off her through wet canvas and damp wool. My knuckles brushed the inside of her wrist as I positioned the bare copper strands against the terminal lug. Her pulse beat strong and rhythmic against my thumb.

"Steady," I muttered, more to my own hands than to her.

"Always," she answered softly.

I wedged the stripped copper into the brass terminal gate. With my left hand holding the insulated driver and my right guiding the wire, I drove the setscrew down. A sharp blue spark snapped across the gap, illuminating her face in a brilliant flash of cold white light.

Morwenna didn't flinch. Her grip on the jumper never wavered by a millimeter.

"First bridge secured," I said, breathing out through my teeth. "Now the logic jumper. Hand me the yellow toggle wire."

She picked the wire from my kit and fed it between my fingers, her skin brushing mine in the tight enclosure. We worked with a synchronized rhythm, matching torque for torque, tightening the four-point shunt that would trick the barrage's mechanical brain into running in reverse.

Every three seconds, the river struck the outer bulkhead with a hollow, booming thump. Water sprayed through the conduit seams, misting our faces and soaking our collars, but neither of us looked up.

"Final shunt in place," I announced, snapping the toggle switch into the manual override bracket.

"Check the indicator," Morwenna said, pointing with a grease-stained thumb.

On the sub-panel, a single amber filament flickered to life behind a thick glass jewel. The logic board hummed—a clean, high-pitched whine that rose above the dull roar of the floodwaters.

"Logic override active," I said. "The gate circuits are live."

"Now we fire the pulse?"

"Now we fire the pulse."

I reached past her shoulder, our chests pressing together in the cramped shaft, and grabbed the primary hydraulic actuator lever. Morwenna laid her palm flat over the back of my hand, adding her weight to the throw.

Together, we wrenched the heavy steel lever down into the reverse detent.

Deep inside the station's belly, thirty-ton hydraulic rams groaned. The massive solenoid bank clattered like gunfire as high-pressure fluid slammed into the reverse conduits. A violent tremor ran through the entire barrage, shaking loose flakes of rust and mineral scale from the overhead pipes.

For two glorious seconds, the acoustic monitor screamed with the sound of reversing flow.

Then came a deafening, metallic shriek.

The sound tore through the conduit shaft like tearing sheet metal. The floor plates buckled under our feet, throwing Morwenna hard against my chest. I caught the bulkhead rib with one arm, wrapping my other arm around her waist to keep us from crashing into the live terminal box.

Down in the intake throat, the heavy bronze valve spindle had shuddered to a violent, shuddering stop.

The reversal had fired, but forty feet below us, the primary gate had jammed dead center against the oak revetment.