Teeth in the Impeller Housing

Brynhild smelled the foul tallow two rungs before her boots hit the discharge bench. The air in the lower conduit was five degrees colder than the yard office above, thick with sulfurous steam, stale coal dust, and a sour, greasy reek that coated the back of her throat like rancid mutton fat. She adjusted the tin collar of her carbide lantern, directing its white beam down the vaulted granite flume. Water ran twelve inches deep over the silt-boards, sluggish and black, flecked with yellowish curds that refused to break apart in the current.

"Mind that seventh iron tread," she called over her shoulder, not waiting to see if Halldor followed. "The lime-wash gang dropped three sacks of gypsum down the shaft in August and never cleaned the brackets. Step wide or you'll break an ankle in the sump."

A grunt and the dull clang of a tool bag answered her. Halldor reached the bottom slab, his heavy canvas apron rustling against his oilskin overalls. In his uninjured left hand he carried a galvanized iron pail scooped from the masonry gang's tub at the shaft head, filled halfway with raw quicklime slurry that smoked faintly in the damp draft. His right hand, wrapped in greasy tallow-cloth to protect his blistered knuckles, clutched a cold chisel and a three-pound sledge.

"Smells like a slaughterhouse drain after a week of rain," Halldor muttered, wiping dark moisture from his chin with the sleeve of his coat. "If your pump-men drink the seepage down here, Engine-Boss, it explains the temper in your letters."

"My pump-men drink chicory from tin cans, Master Riveter, and they keep their wrenches wiped," Brynhild retorted, stepping off the granite landing into the black water. The cold bit through her leather gaiters instantly, numbing her shins. "Follow the rail. Don't drag that lime bucket through the deep gutter. If you spill the wash before we reach the intake casing, you can crawl back up the ladder and haul another thirty pounds yourself."

She led the way forty paces west along the conduit, where the granite arch curved into the subterranean foundation beneath Basin Two. Above their heads, muffled by six feet of dressed stone and twenty feet of timber shoring, the iron keel of the dreadnought Drakansk rested in its cradle. Here in the foundation, the ship was not a soaring wall of armor plate; it was an immense weight pressing downward against the earth, groaning with every shift of the incoming tide.

At the terminus of the flume sat Turbine Two. The pump casing rose eight feet out of the sump, a massive snail-shell of ribbed cast iron bolted to granite footings with four-inch bronze studs. Usually the housing vibrated with a steady, deafening drone that could be felt in a mechanic's teeth from fifty yards off. Now it produced only a strained, sickening hum. High-pressure steam still whistled through the brass governor line, but the six-inch drive shaft had seized solid. Steam pressure was backing into the condenser traps, sputtering through copper drain cocks in violent bursts of white froth.

Brynhild set her lantern on the dry coping of the foundation wall. She unhooked her eight-inch dog-leg spanner from her belt, tapping the cast-iron flange of the cleanout port.

"Governor is holding at four bar," she said, her voice dropping into the clipped cadence of an inspection report. "Steam line is clear. It isn't boiler trouble, and it isn't a sheared keyway in the reduction box. The impeller is choked."

Halldor set the lime bucket onto the stone ledge beside her lantern, his boots splashing through the dark soup as he approached the casing. "Can you trip the bypass lever and blow the housing with raw harbor water?"

"Trip the bypass?" Brynhild glared at him with cold disbelief. "If I drop the bypass gate while the runner is locked, sixty tons of tidal backwash will flood the intake culvert in four minutes. The water will back up through the limber holes and lift the dreadnought right off her keel blocks before Gestsk even rings his six-bell watch. We clear the housing by hand, or we don't clear it at all."

She swung her dog-leg spanner against the four bronze wing-nuts securing the oval inspection hatch on the lower intake throat. The nuts were stiff with dried shale grit, but she used the heel of her boot against the spanner shaft to break them loose one by one. Halldor stepped in with his cold chisel, slotting the edge beneath the lead gasket and levering the cover outward.

The seal gave with a wet, sucking gasp.

A stench rolled out of the open port that made Halldor cough into the crook of his elbow. The smell matched what he had described in the yard office—sour, metallic decay, but here warm, churned into foam by steam jackets and the dying rotation of the bronze vanes.

Brynhild took her carbide lantern from the ledge and thrust the brass reflector directly into the opening.

Inside the eighteen-inch casing, the four-bladed bronze impeller sat frozen midway through its stroke. Wrapped tightly around the hub and threaded through two adjacent discharge vanes was a thick, pale-gray mass of living muscle. It looked like an amputated eel, five inches thick at the core, studded with overlapping plates of translucent horn and hundreds of needle-fine barbs that had dug into the bronze metal. The creature's flesh was not dead; under the glare of the lamp, its slick surface twitched rhythmically, contracting against the bronze edges as if anchoring itself against the suction. Green fluid dripped from dozens of tiny pores along its flank, hissing where it struck the cast-iron lining of the shell.

Halldor leaned close, his rag-wrapped right knuckles shielding his lantern as he held the beam steady. "God above. It's a feeder arm. The thing in cell four reached through the floor drains."

"It didn't reach," Brynhild said, her eyes fixed on the twisted muscle fibers. "The runner severed it when the watch went off. It was sucked down the bilge gutter from the dreadnought's keelson and jammed in the throat. The blades cut two inches into the flank, and the muscle seized around the trailing edge."

She gripped her dog-leg spanner and wedged the forged jaw behind the runner blade, testing the back-torque on the bronze shaft. The resistance was unyielding; the fibrous tissue had wedged itself into the narrow clearance between the impeller tips and the housing ring like vulcanized rubber.

"Hand me the drift-pin," Halldor said, reaching into his pocket. "I'll drive the wedge through the hinge and split the meat off the hub."

"No," Brynhild snapped, slapping his hand aside with her forearm. "Touch that bronze blade with a steel drift under this kind of torsion and you'll chip the trailing edge. Those vanes are cast gunmetal, balanced to an eighth of an ounce. If you distort the pitch by a millimeter, the turbine will vibrate itself off the bedplates the second I give it full steam."

She stepped back to the stone coping and picked up the iron ladle resting across Halldor's bucket. She dipped it deep into the gray quicklime slurry, bringing up eight ounces of steaming, chalky paste.

"The gutter scum along the upper flume was foaming where the lime-wash dripped from the ceiling brackets," Brynhild said. "The mucus curdled on contact."

"Quicklime isn't ash," Halldor warned, watching her ladle hover near the hatch. "It's concentrated alkaline stone. If you splash it into the grease seals, it'll eat the packing yarn out of the stuffing box."

"The packing yarn can be replaced in twenty minutes," Brynhild said. "A cracked impeller takes six weeks to forge in the naval foundry."

She tipped the ladle.

The white slurry cascaded across the knotted tendril, coating the grey plates and the glistening rows of barbs.

The reaction was instantaneous. The gray tissue did not merely flinch; it convulsed violently, thrashing against the bronze vanes with a sickening wet slap that rattled the inspection cover against its studs. A cloud of thick, choking white vapor burst from the opening, smelling of scorched fish skin and caustic lye. Where the lime paste touched the chitinous plates, the armor turned chalky white and curled backward like scorched horn. The underlying muscle blistered into yellow froth, liquefying into thin, curdled jelly that poured out through the drain hole into the conduit water.

Within twenty seconds, the violent tension in the fibers went slack. The barbed claws slipped free from the bronze metal, their hooked tips dissolving into crumbly white flakes.

Brynhild did not hesitate. She dropped the ladle, grabbed her dog-leg spanner, hooked the curved jaw behind the loosened mass, and hauled backward with the full weight of her shoulders.

With a tearing squelch, the scorched tendril pulled free from the impeller throat. It fell into the discharge water at her feet, eight pounds of dead, smoking gristle that quickly dissolved into greasy grey scum under the wash of the current.

Halldor stepped forward, shining his lantern into the housing. The bronze vanes sat bare and undamaged, wet with dark water but free of obstruction.

"Take the governor wheel," Brynhild ordered, her breathing ragged from the vapor.

She scrambled onto the stone footing beside the turbine head, reaching for the master steam bypass valve. Halldor took the secondary brass wheel on the governor line, his boots braced against the slippery masonry.

"On three," she said. "Give it two turns. Don't touch the throttle until the exhaust clears."

Halldor hauled on the brass wheel. Brynhild wrenched the high-pressure valve open with both hands.

Steam shrieked through the manifold pipes. The drive shaft hesitated for a quarter of a heartbeat, shuddered with a deep metallic groan, and then spun into motion. The bronze impeller whistled as it caught the water head, its four blades biting into the flooded sump. Within seconds, the labored hum turned into a smooth, deafening roar that shook the granite ceiling above them. The sluggish water in the conduit began to drop visibly, drawn down by the massive suction of the spinning turbine as forty gallons a second surged through the discharge flume toward the harbor.

Brynhild stepped down into the receding stream, wiping a smudge of caustic white paste from the cuff of her wool jacket with the back of her wrist. She felt no triumphant thrill; her chest burned from the acrid steam, and her ears rang from the deafening surge of the turbine. Yet the machine was running true, and the needle on the foundation pressure gauge was creeping back out of the red into safe working head.

"The lime killed it," Halldor said, his voice raised against the thunder of the pump. He stared down at the gray froth dispersing in the swift current. "It didn't just burn the surface. It melted the chitin straight through the marrow."

"Alkaline lysis," Brynhild replied, her voice cool despite the sweat plastering dark hair to her temples. "The creatures are bound by acidic mucus. Dump enough caustic calcium into their tissue, and their own chemistry tears them apart from the inside."

She reached for the oval hatch cover, setting the lead gasket back into place and spinning the four bronze wing-nuts down over the studs.

A deep, reverberating boom echoed from far upstream, rattling through the granite arch toward the basin's eastern drainage junction. It was the heavy, scraping shudder of an enormous weight dislodging from the stone tunnel walls and tumbling over the diversion weir. The vibration traveled through the bedrock under their soles, hummed through the turbine bedplates, and then smoothed into the steady roar of rushing water.

Down the flume, the discharge current carried an oily slick of green bile and dozens of empty, calcified barnacle husks. The flume swept them cleanly past the turbine intake, funneling the entire caustic drift west into the deep outflow channel.

Brynhild tightened her dog-leg spanner against the final stud until the bronze groaned. She did not hurry, testing each nut in sequence with a double tap of the steel handle.

"It broke away from the keelson," she said, looking down the flume where the dark water surged toward the outer basin. "The discharge current is carrying the dead bulk straight to the sea caissons."

Halldor tapped the crust of lime from his scraper against the coping. "Gestsk drops the lock gates for the six-bell tide. If the carcass jams the sluice tracks, the caisson dogs won't seat."

"Then we aren't clearing culverts with hand ladles anymore," Brynhild said, hooking the dog-leg spanner back onto her belt. She turned toward the access ladder, lifting her carbide lantern to illuminate the iron rungs leading up to the yard. "Sigvard has thirty tons of quicklime in the south kilns, and my culvert boilers carry nine bar of dry head. If Gestsk holds the sea gates shut, we tap the injector manifold and pump scalding lime through every conduit in Basin Two."

Halldor shouldered his tool bag, grim amusement flickering in his soot-lined eyes. "Pressurized lye steam will eat half the iron rivets between here and the outer sill."

"Then your apprentices will have plenty of overtime," Brynhild said.