Cold Water in the Feed Line

Who brought butcher's tallow into a drowned trench thirty feet beneath Siren Tower Four? The stench hit the roof of my mouth the second my boots struck the iron bottom of the shaft, oily and thick enough to gag an ox. I hooked my grease-lamp to an overhead stay and reached for my dog-leg spanner, needing to locate the cracked flange and seal the leak before my starved firebox cooled into slag.

The lower conduit gallery had no business being cold. Steam pipes running four hundred pounds to the square inch should have turned the narrow corridor into a bakehouse, but water was pooling over my boot arches. It ran black and frigid along the gutter troughs, lapping against the granite foundation blocks that anchored the tower to the harbor shelf.

I pressed my copper sounding rod against my teeth and touched the blunt tip to the secondary feed line.

The metal carried no song. A healthy steam pipe purrs like a drowsing cat, humming steady through the enamel and jawbone. This line was dead. The shudder I had felt on the furnace deck above had not come from an over-pressured surge or a blown copper gasket. It was the dull, slapping flutter of cooling condensate backed up against an obstruction.

I moved down the narrow trench, holding the wire cage of the grease-lamp low. The flame flickered yellow behind its mica pane, throwing greasy shadows across the sweat-beaded lagging.

Six strides past the drainage sumps, the copper lagging ended in shreds.

Someone had stripped the horsehair insulation with a hook knife and kicked the wet tufts into the bilge. Beneath it, the six-inch copper delivery tube had not ruptured outward from water-hammer. The split was not the jagged, star-shaped tear of overstrained metal.

The cut was straight. It ran true and level around the entire circumference of the tube, with the clean, rolled lip left by a heavy three-wheel pipe-cutter.

I ran my thumb over the severed edge. Fresh grease coated the bevel—pale mutton tallow, used on thread-cutters to keep the iron wheels from squealing against copper. The bastard who did it had even wiped the excess off on the wall bracket, leaving a smear of white lard over the red-lead primer.

A stoker might crack a valve from panic. A drunken trimmer might let a boiler run dry until the crowns dropped. But nobody carried a three-wheel pipe-cutter through an active battery gallery by accident. You needed two hands, twenty turns around the tube, and five minutes of hard muscle to shear copper that thick.

Whoever turned the screw had worked while I was topside shoveling slack into firebox three.

A sudden tremor rolled through the floorplates, sharp and violent enough to rattle the fillings in my jaw. It came from the seawall outside—the first heavy crest of the fog-tide striking the outer granite breakwater. Out in the mudflats, the marsh beasts would be scenting the salt surge, pulling their bloated bellies out of the black sludge to follow the high brine into the harbor basin.

If Siren Four stayed silent when the tide crested, the lower wharves would be swallowed before midnight.

I straightened up and looked at the severed line. Without this bypass loop, the main horn manifold on Catwalk Seven could not draw auxiliary steam to prime its acoustic chamber. Opening the primary throttle right now would only dump cold condensate into the red-hot sirens, cracking the brass bells into flying shrapnel before they produced a single note.

To bridge the gap, I needed the emergency crossover valve on Catwalk Seven. And to turn that valve, I needed the master conduit key.

Master Stoker Carrow kept the official key locked in the watch office by the harbor gate, three hundred yards through naval checkpoints that were likely already locking down. But Carrow had spent thirty years on the seawall batteries, and he did not trust watch officers, guild clerks, or brass padlocks.

I turned back toward the ladder well and counted the floor grates.

One, two, three. At the fourth iron plate, just below the return flue, I dropped to my knees in the greasy water.

The bilge was foul here, rank with the decaying marsh weeds sucked in through the seawall weep-holes. I slid my fingers along the underside of the bearing flange until my fingernails caught a notch filed into the rib. Two notches. Carrow’s mark.

I jammed the wedge end of my spanner beneath the rim and threw my weight onto the steel handle.

The iron plate screeched as the rusted dogs gave way, lifting six inches out of its frame. Beneath it lay a dry pocket welded directly to the warm brickwork of the chimney foundation.

Inside sat a heavy canvas bundle, wrapped in oiled sheepskin and tied with tarred hemp.

I cut the cord with my belt knife and folded back the skin.

The tools inside gleamed under the grease-lamp. There was a twenty-four-inch spanner forged from solid naval brass—sparkless, weighted for heavy work on live steam lines—and a four-foot tubular steel cheater pipe to slip over the handle for double leverage. Beside them lay the master conduit key: a foot of solid iron with an eight-point cross socket at the head and a tapered wedge foot for prying stuck valve gates.

It was everything needed to crack an auxiliary bypass that had been frozen shut since the winter freezes.

Carrow had stashed them here three seasons ago, after the Salt Exchange attempted to audit the tower's emergency scrap bins. Never leave your iron where a man with clean hands can count it, he’d told me, tapping his soot-stained knuckle against my jaw so I would catch his lips. When the pipes go bad, Della, the men in uniforms run away. The spanner stays where you drop it.

He was supposed to be at the top of the tower right now, dropping the counterweight to engage the manual whistle wire.

I tucked the master key through the leather loop of my tool apron and slung the brass spanner over my shoulder by its canvas strap. The cheater pipe went into my left hand, cold and reassuring against my blistered palm.

With these, I could force the high crossover manually, bypass the severed copper line, and feed dry steam directly into Siren Four's throat. It was brutal work that would blow the gland packings out of the upper chests, but the horn would sound.

I stepped to the vertical iron ladder that climbed through the central masonry core toward Catwalk Seven.

The ladder was eighty feet of ribbed iron rungs pinned to the granite blocks, vanishing upward into the sulfur mist drifting down from the flue exhausts. Normally, the rungs hummed with the steady, hydraulic thrum of the tower's main draft.

Tonight, the vibration coming down the iron was jagged.

I put my bare palm against the third rung.

The metal did not sing. It shuddered with a rapid, uneven hammering—the frantic, desperate cadence of heavy work boots scrambling across wet iron high above, punctuated by a dull, dead impact that made the entire ladder rattle in its granite moorings.

Someone was fighting for their life on Catwalk Seven.

I gripped the cheater pipe, wedged the brass spanner tight against my ribs, and started up the ladder.