The heat inside the coal vault was climbing steadily. That turned the air into a wet, choking blanket that tasted of boiled iron and sulfur. Ada Morland knelt on an oak wooden props balk Eren had wedged across the sump opening, her rubber boots braced against the slippery wet stonework. The water gushing past her knees was ninety-two degrees. It sent curls of dense white vapor up into her face.
Across the cellar floor, the thick carpet of yellow foam continued to churn, rimed at the edges with white pipe lime that had leached from the mortar joints under the boiling flood. Every breath tasted of wet silt stench and ancient river mud. On the stone ledge above the under-road drain, Eren had laid his emergency kit. Two spare oak wedges, a tub of animal fat, and a spool of heavy waxed hemp string.
‘Nine minutes leftover,’ Ada said calmly, not taking her eyes off the jammed flap. In thirty years of heavy-duty plumbing, she had worked inside town sewers, chemical dye tanks, and burst district heating mains. Panic was an expensive amateur luxury that never cleared a drain.
She took her long-shanked packing hook, worked the curved, hardened steel tip behind the mass of fused boiler clinker, and hauled backward with the full weight of her shoulders. The tool bit into the hardened crust with a sharp, gritty crunch. A chunk of black melted rock waste the size of a loaf of bread broke free, tumbling into the swirling foam.
A violent hiss of steam erupted from the exposed cavity, spraying scalding drops against Ada’s heavy reed gauntlets. The boiled canvas fabric hissed, darkened, and shed the boiling moisture instantly, exactly as Jo Saye and Dima Fen had engineered.
‘Good cloth,’ Ada muttered under her breath. ‘Eren, wedge the chisel end of that ash bar between the flap ear and the collar pipe rim. Don’t pry downward. Lift the hinge pin a tiny fraction of an inch to take the binding strain off the bronze bushing.’
Eren moved with the slow, deliberate economy of a seasoned shipwright. He drove the iron-shod tip of his six-foot ash pry bar into the gap, braced his shoulder against the rough brick arch, and bore down with all his eighteen stone of weight. The seasoned ash groaned under the tension, its grain twisting. But the iron collar shifted a fraction of an inch.
Eren knew the breaking limits of northern white ash as intimately as a musician knew string tension. He didn’t heave with sudden, jerking violence that could shatter the timber along its heart-ring. Instead, he applied steady, deep water pressure. He used the weight of his torso to bend the lever until the iron studs groaned in their lead settings.
‘Got it,’ Eren grunted through clenched teeth, sweat pouring down his beard into his wool tunic. ‘The hinge has play. But the grit is packed solid behind the balance weight.’
‘Pella, hold that lantern right at my shoulder,’ Ada ordered. ‘Don’t let the shadow cross the seating face.’
Pella stepped onto the wooden props balk, her boots steady despite the rushing water below. She held the horn lantern directly over Ada’s head, lighting up the dark, rusted through inside of the iron throat. The water roared around them, an ear-splitting, nonstop clouded eye that shook through the bones of their legs.
Ada worked with furious, razor-sharp care. She drove the packing hook deep into the clinker bed, twisting the T-handle to fracture the baked settled mud. She hauled out compacted lumps of coal dust, twisted river reeds, and chunks of glass-fused melted rock waste, tossing them behind her into an empty iron bucket Tavi held ready.
The bucket filled rapidly with steaming, sulfur-crusted sludge that reeked of copper green rust and decaying vegetation. Tavi hauled the first full bucket back toward the stairs, his small arms straining under the twenty-pound weight, then scrambled back with a second empty pail.
Through the open floor hatch above, several of Orv’s tenants were peering down through the cracks in the floorboards. Their pale, anxious faces were lit up by the lantern glare. They watched the strange woman in blue overalls wrestle with the roaring throat of the river.
Ada reached deep into the upper hinge pocket with a narrow wire scraper. She pulled free a twisted tangle of old iron wire and horsehair packing that someone had jammed into the pivot twenty years earlier to stop a minor rattle. The wire had rusted into a barbed knot, binding the hinge arm against the casting.
‘Look at this,’ Ada spat, tossing the rusty wad into the bucket. ‘Some backyard tinkerer thought he could silence a flap valve with baling wire. It’s a wonder this gate dropped at all in the last ten years.’
‘Two more inches of clinker,’ Ada shouted over the din. ‘The lower sealing lip is clearing. Watch your toes, both of you!’
The grit behind the hinge was the hardest part. It had fused into a solid wedge under months of high-pressure compaction. Ada discarded the hook, picked up her cold chisel, and set the hardened edge against the binding seam. With three sharp blows of her dead-blow mallet, she fractured the core of the clinker cake.
With a final, desperate heave, Ada drove her copper dead-blow mallet against the back of the packing hook. The hardened steel tip punched straight through the leftover crust. A massive wedge of baked silt and gravel collapsed outward into the current.
Without the grit supporting its weight, the eighty-pound cast-iron flap valve was suddenly freed to obey gravity and the differential head of the river outside.
The massive iron disc swung downward through the rushing water with terrifying driving force. It struck the machined bronze seating ring of the collar with an ear-splitting, metal slam. A sound like a cannon shot fired inside an iron barrel. The impact sent a violent tremor through the foundation stonework. It shook dust from the brick vault above.
The roar of rushing water vanished.
In an instant, the ear-splitting clouded eye was replaced by the sudden, eerie silence of a cellar holding its breath. The high-pressure geyser of boiling foam that had been erupting through the floor stopped fully, cut off by eighty pounds of solid iron sealed against the bronze face.
Ada remained frozen on the timber balk, her packing hook still raised. She listened with every nerve in her body. For three seconds, the only sound was the heavy, ragged breathing of Eren Tal and the steady drip-drip-drip of water drops from the ceiling beams.
Then, with a low, sucking gurgle, the four inches of yellow foam on the cellar floor began to move. But it was no longer rising.
Deprived of the backflow pressure from the river under-road drain, the trapped water responded to the natural slope of the floor. It began draining rapidly toward the low-level floor grating near the chimney base, swirling into a wide, dirty whirlpool that sucked floating potato skins, coal dust, and dead beetles down into the sump.
‘It’s dropping,’ Pella whispered, watching the water line recede from the bottom course of brickwork. ‘Eren, look at the wall. The water is falling.’
Eren slowly released the tension on his ash bar. He lowered the timber to the flat stone slabs with a deep, shuddering exhale. He wiped his face with a sooty forearm, staring down at the cast-iron collar. A thin trickle of clear water was seeping around the bottom outer edge of the flap. But the massive boiling backflow was entirely gone.
‘Seated dead true,’ Eren said, his voice husky with relief. ‘The bronze face held. Hal Rook built that seating forty years ago, and it still holds twenty pounds of head.’
Ada wiped the bronze seating ring clean with a scrap of oiled linen, checking the outer edge with the flame of an animal fat candle. The yellow flame burned steady and upright in front of the seam, proving that no air or high-pressure vapor was whistling through the joint. ‘The clockwork seal is holding ninety-eight percent,’ Ada said, tapping the collar with her knuckle. ‘The leftover slow leak is just water drops weeping from the cold iron casing.’
Eren inspected the oak balk he had used as a pivot point. He ran his hand over the tightly packed grain where the ash bar had bitten into the timber. ‘The wood held, but the surface fibers took thirty percent crush. I’ll leave this balk wedged under the brick arch as a permanent shore. If the foundation settles another quarter-inch, the timber will keep the chimney breast from dropping into the chimney pipe.’
Ada glanced down at her wrist. Her stopwatch showed four minutes and twelve seconds leftover on her transit window. She unclipped her pressure pipe hub, wiped the brass dials with a clean rag. Then she knelt by the drainage grating to inspect the receding water.
‘The flap dropped, yes,’ Ada said, her voice serious and quiet. ‘The main solitude is successful. But don’t start celebrating yet, girl. We just shut a door in the face of five thousand gallons of moving water. That pressure didn’t vanish into thin air. It had to go somewhere else.’