Crawling into the breach was like squeezing down the gullet of an ancient stone giant beast. Pella wore a pair of heavy cowhide gaiters tied over her trousers and thick leather work mitts to protect her palms from the jagged shards of broken drainage tile. Behind her, the canvas wind-chute hummed with Eren’s steady pumping from the yard, bathing the back of her neck in a nonstop stream of cool, fresh surface air.
The gallery was narrower than it appeared from the larder floor. Scarcely three feet in width, built of dense, glass-fused baked-clay segments laid end to end inside a casing of rough river limestone. The air was cool where the blower reached. But the curved floor beneath her knees was strangely, uncomfortably warm. A faint crust of pipe lime clung to the curved mortar seams. It crumbled into dry white powder under her boots.
The smell of wet stonework and dark oak-ink stayed in her clothes, reminding her of the long afternoons she had spent cataloging discarded drainage scrolls in the college basement. But here, there were no theoretical diagrams. Every brick was laid in heavy lime mortar, scarred by the scraping of river gravel and the passage of winter floods.
Her progress was slow, measured by the rhythmic rasp of her leather gaiters against the salt glaze. She carried an oilcloth roll containing Hal’s check tools: three brass feeler gauges, a cold chisel, a flat scraper, and a small horn flask of sweet oil. Every six feet, she paused to inspect the condition of the baked-clay bell joints. She scraped away the river silt to check for outward stress cracks.
The pipe was old—predating the College’s Grand Reconstruction by at least two ages. The clay was dark terracotta, fired hot enough to turn into glass the inside into a glassy, impermeable red surface that resisted the acid of river muck. But along the top side, where steam had collected, the glaze was blistering away in thin, brittle scales that flaked under her fingertips like dry fish skin.
Pella shone her lantern upward against the brick vaulting. The ceiling bricks were damp with oily slow leak, sweating heavy droplets of water that smelled of ancient peat. Hal had pointed out similar stonework work when she was eight years old. She walked the low-tide embankments of the Gray Rush. He had shown her how the old builders keyed their arches without centering frames, relying on the weight of the overhead gravel to wedge the bricks into permanent squeezing.
Twenty feet in, Pella pulled her animal fat lantern forward. She held the mica chimney close to an iron collar that clamped two baked-clay pipe bells together. The iron was heavily crusted with flaking rust and patches of pale green copper green rust where an ancient bronze ground-wire had been soldered to the casing.
Her fingers brushed against something smooth beneath the encrustation on the underside of the collar. She took out her brass scraper and gently flaked away a layer of dried river settled mud. Beneath the mud sat a lead seal the size of a teacup saucer, pressed flat into a recessed bronze housing.
Stamped into the lead was the clear three-oar crest of the Old Ferry Watermen’s Guild. And below the crest, cut deep with a cold chisel in firm, impatient block strokes, were two initials: H.R.
Pella’s breath caught in her throat. She set her thumb into the groove of the letters. Her father had chiseled this mark fourteen years ago, before the Summoners’ College had centralized the river water gates and driven the independent water mechanics out of the lower wards. She remembered his hands. Scarred at the knuckles, stained with black pitch and machine grease. It smelled of cedar sawdust and river water.
Wired to the lead seal by a twist of hardened brass wire was a stamped sheet of thin copper—an official town check tag. Pella rubbed the grime from the metal with the hem of her wool apron. The stamped words were still sharp and readable: Bypass Relief Throttle. Do Not Weld Shut. Flow Balances High Sluice Pressure to Avoid Bedrock Bubble-hammering.
“He marked it,” Pella whispered into the stone tunnel, her voice flat and small in the narrow space. “He knew this trunk was carrying the relief overflow. He put his own name on the lead so the town wardens couldn’t claim it was an unlicensed spur.”
Behind her, the distant scrape of Eren’s boots sounded as the wheelwright crawled into the mouth of the breach to pass her a fresh roll of measuring tape and an ink slate. “Find something?” his muffled voice echoed through the baked-clay pipe.
“Hal’s seal,” she called back. “Fourteen years old. He left a warning tag on the throttle. He told them never to weld it shut. He knew the high water gate couldn’t handle the full surge without this line.”
“Well, someone didn’t listen to him,” Eren muttered from twenty feet back. His voice shook with the low deep ring of the pipe. “Because the entire floor under my knees is shaking like a millstone running on dry bearings. The silt stench down here is getting thicker past the thirty-foot mark. Keep moving forward, Pella. See what they put on the other side of that throttle.”
Pella took her grease pencil. Then she drew a circle around the lead seal on her linen sketch map, noting the depth and the date. She took a sip of cold boiled tea from the small tin flask hooked to her belt, steadying her trembling hands against the warm baked-clay casing.
The stone smelled of old iron, stale water, and the faint, bitter tang of burning spirits upstream. Hal had built this relief line to save Lowbank from drowning in its own backing-up pressure, and someone had clamped it down. She pocketed the brass scraper, gripped her lantern handle, and crawled forward into the deeper dark.
The baked-clay casing under her belly grew hotter with every five feet. Her leather mitts began to sweat against her palms. The lime dust clung to her forehead like wet chalk. She reached out with Hal’s measuring tongs, measuring the outer width of the glass-fused pipe. Thirty-six inches. The collar was three inches thick, heavy with banded hoop iron to withstand sixty feet of head pressure.
“He built it for a flood,” she said softly. She felt the deep, heavy throb of the water rushing beneath the clay. “He didn’t build it for an engine. If they keep running boiling salt water through this clay, the salt glaze is going to peel like birch bark.”
Beside the pipe, the limestone bedrock bore the marks of Hal’s hand-held star drills. Neat, circular holes where he had set oak plugs to check for bedrock settlement. He had left a datum scratch every ten feet, filled with red lead paint. Pella laid her brass rule across the scratch at the twenty-foot mark. The bedrock had dropped three-eighths of an inch toward the river since her father’s time.
“The whole bank is subsiding,” she noted on her slate. “The weight of the new terrace walls is tilting the old under-road drain toward the water. If the pipe cracks at the bell, the river will pour straight into the cellar foundations.”
She ran her hand along the mortar joint where Hal had troweled in dark fiery volcanic cement. The mortar was still rock-hard, showing the imprint of her father’s thumb where he had smoothed the fillet. Fourteen years of flood water and academy neglect had washed away the lime from the surrounding stones. But Hal’s joint held like iron.
Pella looked down at the floor of the gallery where the glass-fused clay joined the limestone footing. Hal had cut three shallow relief channels into the bedding stone, each two inches wide and packed with clean, washed pea gravel to allow groundwater to drain toward the river without lifting the pipe bells. Even in the dim mica lantern light, the gravel was clean, free of the black colloidal mud that choked the unmaintained drains of the upper wards. Hal had washed every shovelful of that stone in river water to make sure it wouldn’t silt up.
From the breach behind her, the steady rhythmic thumping of Eren’s bellows continued, a comforting pulse of surface life that kept the dead damp at bay. ‘Tide’s rising at the lower slips!’ Eren called through the chute. His voice carried the dry ring of a man who watched the harbor watermarks like a hawk. ‘The outer flap is knocking against the granite doorstep! You’ve got twenty minutes before the backing-up pressure lifts the river seals!’ Pella wiped the sweat from her eyes with her sleeve, closed her tool roll. Then she prepared to crawl back to the larder.