The Grand Sluice

"Now," Hale breathed from the dark recess.

Toliman did not hesitate. He struck the base of the pry-awl with the heavy square face of his eighteen-inch spanner.

The bronze shear-pin snapped with the crack of a pistol shot.

The lead counterweight plummeted inside the masonry well. The four-ton iron weir dropped like an executioner's blade, shrieking down its greased wall-channels. The lead tender threw himself backward with a desperate, choking curse, but the descending iron caught the long copper snout of his sulfur-lance, shearing the nozzle clean off and slamming down onto Toliman’s steel drift-pins with an impact that shook the entire conduit ceiling.

Mortar dust and dried river scale cascaded from the vaulting in a blinding white cloud.

The heavy bottom bar of the weir hung vibrating precisely fourteen inches above the floor, locked solid against the drift-pins and screw-clamps.

In the same split second, the falling counterweight snapped the copper trigger lead to the overhead hoppers and the bypass sluice.

High above the arch, the heavy iron hopper gates slammed open with a booming clang. Tons of coarse rock-salt roared down the flues, colliding with a deafening surge of green high-tide river water unleashed from the upper bypass. The backed-up head from the Grand Sluice reservoir erupted into the narrow five-foot conduit with the force of a battering ram.

A churning, white-crested wall of hydraulic pressure slammed into the far side of the weir. The surging flood, saturated with thousands of pounds of scouring rock-salt and caustic chemical runoff, turned the narrow space into a roaring vortex.

The lead tender had fallen on his back on the far side, but the sheared edge of the falling gate had pinned his right foot by the heavy iron heel-cleat, trapping him flat against the drowned flagstones. He clawed at the stone with his gauntlets, thrashing as the rising flood of salt-water and chemical slurry swirled around his waist, struggling to pull his trench-knife from his belt sheath.

"He’s reaching for the flare canister!" Hale hissed. She darted forward through the boiling spray, sliding low on her knees across the wet sill, her skinning awl gleaming in the sickly yellow flare-light.

"Hale, stay behind the sill!" Toliman warned, but she was already at the fourteen-inch gap beneath the iron bar.

The trapped tender slashed blindly through the gap with a broad-bladed butcher's knife, catching the edge of Hale’s canvas sleeve and laying open the fabric. Hale did not flinch; she drove the steel spike of her awl straight down through the leather cuff of the tender's right wrist, pinning his weapon-hand to the wood-lined sill with a wet, solid thud.

The man shrieked behind his charcoal visor, dropping the knife.

On the other side of the grate, the second crewman fought his way through the surging knee-deep torrent of salt-water, stepping up to the bars and raising a short-handled trench-mace with four fluted steel flanges. "Die, you gutter rat!" he roared, thrusting the mace through the upper iron slats to smash Hale’s skull.

Toliman stepped in front of her.

He did not use a blade. He brought the eighteen-inch steel spanner around in a short, brutal arc, catching the man’s thrusting forearm against the iron bars. Bone snapped with a dry, sharp crunch. The tender screamed, dropping the mace into the rushing water, and stumbled backward into the roaring hydraulic surge, clutching his shattered arm against his soaked leather apron.

Behind the weir, the full force of the tidal reservoir slammed down the throat of the conduit. The massive volume of backed-up river head, constricted by the fourteen-inch bottleneck beneath the dropped portcullis, generated a crushing hydraulic wall on the far side. The roaring torrent swept the second and third tenders off their feet, smashing their heavy sulfur reserve tank into the ashlar walls and extinguishing their flares in an explosion of frothing brine.

Trapped in the five-foot tunnel between the churning hydraulic surge and the breached third salt-lock behind them, the tenders broke. Screaming through their charcoal filters, choking on brine and battered by the scouring rock-salt slurry, the two standing crewmen abandoned their gear and were swept north into the drowned darkness of the High-spill, their desperate splashing swallowed by the echoing roar of the draining reservoir.

As the tidal head finished its surge, the water level in the conduit dropped rapidly, draining through the floor inverts into the deep siphon culverts below.

Silence rushed back into the conduit, broken only by the rhythmic dripping of water from the ceiling arches and the faint, dying hiss of the sulfur-paste dissolving in the heavy brine pooling around the iron grate.

Toliman let out his breath in a slow, controlled shudder. He wiped the wet lime dust and salt spray from his brow with the back of his canvas sleeve, his heart hammering a steady, mechanical rhythm against his ribs.

At his feet, beneath the fourteen-inch clearance of the dropped weir, the lead tender was still breathing.

The man’s charcoal visor had cracked during the struggle, and a thin trickle of dark, unpurified blood was leaking from the corner of his mouth down into the brass filter rim. His trapped foot was twisted unnaturally beneath the iron cleat, and his pinned wrist twitched against the sill where Hale's awl held it fast.

Hale crouched on the wet flagstones beside Toliman, her breath rattling slightly in her chest, her fingers already reaching for the heavy brass-cased pneumatic sulfur-drill that lay half-submerged in the rock-salt silt beside the tender's limp body.

"We take the drill," she said, her voice hard and transactional. "The core-feed is solid phosphor-bronze. It’s worth thirty silver bits in the upper exchange, or we can use the carbide tines to cut the sluice bypass into the riverbed."

Toliman did not look at the drill. He reached down with his gloved hand and stripped the cracked brass visor off the dying man’s face.

The skin beneath was pale, leathery, and scarred by years of handling caustic distillation slimes, but the heavy brow and the broken bridge of the nose were instantly familiar.

The tender coughed, a wet, bubbling rattle that sprayed dark flecks of blood across his leather collar. His bloodshot eyes blinked against the dim lantern glow, rolling upward until they locked onto Toliman’s face.

A terrible, faint twitch touched the corner of the dying man’s mouth.

"Toll..." the man whispered, his voice whistling through the bloody froth in his windpipe. "The... the old South Sluice-master... It was you... who took the cylinder..."

Toliman went utterly still. The cold in the conduit seeped through his boots, through his bones, freezing the breath in his chest.

"Mallow," Toliman said, his voice barely a murmur.

"Fletcher... already knows your work, Gateward," Mallow wheezed, his fingers clawing weakly at the wet silt on the sill. "He had... the lead impressions of the Bone-row latch... He said only one man... in this cursed province... filed his ward-teeth at twenty-two degrees... You can drop all the iron you want... Toll... He’s bringing the heavy cradle down... to the Grand Conduit by dusk..."

The dying man’s head jerked once to the side. The tension in his pinned arm went slack, his fingers uncurling into the dark water.

Hale jerked her awl free from the wood and wiped the dark steel blade clean on the dead tender's leather apron. She picked up the heavy pneumatic drill, hauling its eight-pound brass cylinder and carbide sounding-tines out of the mud, and looked up at Toliman.

The sulfur vapor was already gone, washed away by the torrent of brine and drawn northward toward the shattered salt-lock by the cold river draft. The Upper Weir stood locked and immobile on its steel drift-pins, a wall of four-ton iron separating them from the empty tunnel beyond.

Toliman did not speak. He picked up his eighteen-inch spanner from the floor, slotted it over the distorted iron dog-latch on the right rail, and drove the locking nut three turns deeper into the granite casing, securing the dropped gate so firmly that no tool short of a siege ram could ever lift it again.

He took the pneumatic drill from Hale’s hands. The cold brass and heavy carbide tines settled into his grip with the familiar, unforgiving weight of the city's machinery.

"He knows my name," Toliman said, turning his back on the iron grate and facing the dark approach tunnel that led down to the submerged siphon of his sanctuary. "Pack the sounding-charts and the solvent lines, Hale. We have until dusk before Fletcher seals the lower flues."