Pressure Drop

The high-pressure brass manifold was trembling two marks into the yellow before Tivian even had the collar locked down. That meant the undercurrent in the Deep-Drifts was already running two knots faster than the tide-tables promised, or something down in the trench was churning the silt into soup before the turn.

"Hold your jaw still, boy," Oszkár grunted, smearing a thick ring of sheep-tallow around the neck flange. The old man's breath smelled of chicory and stale pipe tobacco, hot against the damp morning fog hanging over the scow. "If you chew your lip while I seat the crown, the seal bites crooked. Then you get forty fathoms of caustic brine whistling down your collar-studs, and I have to explain to your aunt why your lungs look like pickled tripe."

"The grease smells rancid, Uncle," Tivian said, squinting through the salt-crusted deck grating of their work-barge, the Holló. "Did you buy this from the tallow-renderers by the slaughterhouse?"

"I bought it from Old Gáspár for six coppers a tub. It stops the sulfur in the silt from eating the vulcanized rubber before you hit bottom. If you wanted lavender oil, you should have stayed in the Upper Reach and married a silk merchant's clerk." Oszkár tapped the rim of the copper breastplate with the flat of a wooden mallet. "Eighty sovereigns for the suit, forty for the lead soled boots and the secondary air bottle, and ten more to patch the diaphragm in the back-valve. We have seventy sovereigns left from Lady Várady's pouch, and if you tear this canvas, we are back to hawking scrap brass at the canal gate."

Tivian shifted his shoulders inside the heavy canvas-and-rubber rigging. The secondhand diving dress had belonged to an imperial dockyard diver before the southern slipways went bankrupt. It was stiff, smelled of mineral naphtha, and squeezed his ribs with the weight of twenty pounds of rolled copper and lead ballast. Three days ago, their life was simple ditch-scraping and keeping their skiff out of the cartel's hands. But the moment Szabol smashed their main diving bell, the old life was gone. Taking Várady's advance was the only way to keep House Lánczy from being swallowed whole by the Red Channel Syndicate.

Yet as he stared down at the black, churning water, the larger question gnawed at him: what had the imperial navy locked away in the Deep-Drifts that made a high-born merchant lady risk treason and a cartel boss send killers to forty fathoms? If he survived this dive and hauled that coffer to the surface, was he saving his family from the cartels, or handing Várady the very key to tear Vízvárad apart?

The seals were sound, the breastplate had been stamped with double rivets, and the Mark IV Silt-Engine they had pulled from the flooded skiff two days ago was purring on the Holló's aft deck like a fat, brass cat.

Its drive-belt whipped in a steady, bronze blur, turning the twin reciprocating pistons of the high-pressure air pump. Each stroke sent a rhythmic, hollow thung-chunk through the barge's timber deck.

"The pump's holding twelve atmospheres," Tivian said, checking the braided umbilical coiled at his boots. The rubber-wrapped canvas line ran from the receiver tank on deck to the brass regulator strapped to his chest harness. "If the engine coughs, you switch to the hand crank immediately. Do not try to clear the fuel injector first."

"I was pumping air to divers before your mother taught you how to grease a hinge," Oszkár muttered. He picked up the heavy domed helmet, its three round viewports of thick quartz glass catching the gray dawn light. "Remember the depth. Sixty paces down, the light is dead. You follow the shot-line to the anchor stone. The current will try to sweep you west toward the Iron Siphon, so keep your trim heavy. When you find the hull, you look for the breach behind the boiler housing. You do not wander into the crew quarters. You do not pry open loose lockers. You find that iron-banded coffer, clip the haul-line to the ring, and pull the signal cord three times."

"Three tugs for haul, four for fouled line, five for emergency hoist," Tivian recited. He touched the heavy brass spanner slotted into his thigh sheath, right beside the double-edged diver's knife. "And if anyone else is hovering around the shelf?"

Oszkár’s clouded eye narrowed. He adjusted the leather strap holding the emergency air cylinder against Tivian’s spine. "The Red Channel Syndicate doesn't run deep suits. Szabol's boys use open hoods and weighted shoes for shallow ditch-scraping. If they came out this far, the pressure would crush their ribs into kindling. But Várady's gold came with teeth, Tivian. Keep your knife lanyard looped to your wrist."

Tivian nodded. He stepped onto the drop-platform suspended over the dark, oily water of the Deep-Drifts.

The Deep-Drifts were not like the shallow domestic canals of Vízvárad. Here, past the Outer Sluice arches, the riverbed plunged into a colossal submerged canyon where the old city’s foundational masonry met raw black bedrock. The water was dark as boiled tar, thick with industrial tailings, runoff from the alchemical foundries, and the ancient, caustic silt that gave the lower river its yellow tinge.

Oszkár hoisted the copper dome and dropped it over Tivian's head.

The world contracted instantly into the smell of tallow, cold iron, and the sharp hiss of air rushing into the helmet through the crown valve. Oszkár rotated the dome until the interrupted threads clicked home, then drove the brass locking pin into the neck flange with a sharp tap of his mallet. He tapped three times on the front viewport—the universal diver's signal for ready.

Tivian raised one gloved hand, giving the thumbs-up through the quartz pane.

The platform groaned. Oszkár released the brake lever, and the weighted cradle plunged into the river.

The shock of the water hit like a falling wall.

Green-brown murk swallowed the sky in a heartbeat. The roar of the surface air, the screech of gulls, and the clatter of the silt-engine died away, replaced by the deep, resonant drumming of the water against the copper dome and the rhythmic shhk-ahhh, shhk-ahhh of the intake valve at his cheek.

Tivian grabbed the descending shot-line with both heavy gloves, letting the sixty-pound lead soles drag him down through the upper strata.

At ten fathoms, the green tint vanished. The water turned a flat, bruising slate, then deepened into impenetrable ink. The temperature dropped sharply, the cold seeping through the vulcanized canvas and linen undersuits until his fingers ached inside his rubber mittens.

With every fathom, the water leaned harder against his chest. The canvas tightened against his thighs and forearms like shrinking leather. Tivian worked his jaw, popping his ears as the internal air pressure pushed back against the weight of the river.

At twenty fathoms, the current hit him.

It was not a gentle drift. The Deep-Drifts were an underwater river within a river, a torrent of freezing, silt-laden water rushing through the bedrock trench toward the city’s massive intake tunnels. The shear tried to rip his grip from the shot-line, twisting his body horizontal.

Tivian did not fight the surge with raw muscle. A diver who fought the drift exhausted his air and tore his suit. Instead, he angled his shoulders into the current, presenting the rounded profile of his copper breastplate to the flow like the prow of a barge. He felt the vibration humming up the brass manifold on his chest, reading the micro-pulsations in the line. The current was pulsing in three-second surges, driven by the distant churn of the municipal floodgates above.

Timing the gap between surges, Tivian kicked downward, sliding ten paces down the weighted line during each momentary lull.

Forty paces.

His lead boots struck hard stone with a muffled, metallic clonk.

A cloud of fine, ochre silt billowed around his legs, glowing faintly with the sickly, phosphorescent sheen of chemical runoff. Tivian stood on the floor of the trench. The pressure here was immense, a heavy, suffocating hand pressing on every square inch of his armor. The quartz viewports groaned in their brass bezels, settling deeper into their gaskets.

He unclipped the waterproof tallow-lantern from his belt, struck the internal flint-wheel with his thumb, and watched the chemical wick flare into a harsh, greenish beam.

The light cut five yards into the soup before scattering against the dense drift of suspended particles.

Tivian checked his bearings. The shot-line anchor was wedged into a split paving block of the sunken district. Ten yards to the north, the bedrock dropped away into an even darker crevasse, but jutting from the edge of the shelf like the shattered ribcage of a leviathan was the silhouette he had studied on Várady's stolen charts.

K-884-V. The Kormorán.

The wreck did not look like the civilian cargo hulls that rotted in the shallows. Even after five years buried in the toxic drift, its lines were unmistakably military. The hull was sheathed in thick plates of rolled boilermaker's iron, riveted over an angular, low-profile frame built to withstand ramming and shallow torpedo fire. It lay on its port side, wedged at a thirty-degree angle across a collapsed stone culvert.

Its timber decks had long since rotted away, but the iron skeleton stood intact, covered in thick mats of gray river-moss and corrosive sulfur crusts.

Tivian approached with cautious, deliberate strides, his boots sinking two inches into the soft silt bed with every step. He kept one hand on his umbilical, paying out the slack carefully to ensure the thick line didn't loop over a jagged shard of iron plating.

He reached the midships section. Just as the sounding ledger had noted, the main cargo hatch had been sealed with cross-bolted iron bars, but twenty feet aft, near the engine compartment, a massive explosion had torn the hull wide open. The jagged edges of iron plate curled outward like peelings from a whittling knife, coated in yellow chemical deposits.

That was no boiler rupture, Tivian thought, tracing the flared metal with his brass-bound glove. A dockyard boilermaker knew the difference: high-pressure steam blew seams along the grain of the rolled plate, but this iron was curled outward by sulfur-powder detonated from within. Someone had scuttled the Kormorán deliberately, preferring to drown fifty crewmen rather than let the Upper Reach inspectors log what was stowed in the ribs.

The thought didn't make him flinch; it made his grip tighten on the wrench. In Vízvárad, the great houses treated lives like tallow gaskets—disposable once the seal hardened. But Oszkár had spent forty years coughing black silt to keep the Lánczy name off the cartel indenture rolls, and Tivian wasn't about to let high-born games or forty fathoms of dark water break their lease.

He checked his chest regulator. Air was flowing steady and dry, though the Mark IV engine's pulses felt distant, vibrating down forty fathoms of rubber hose like the heartbeat of a sleeping beast.

Tivian unhooked the brass search-hook from his tool harness, wedged it into the tear in the hull, and pulled himself through the breach into the interior of the dead ship.