The Inspection Gallery

Aysun-bek reached out and caught Devran by the shoulder. "We take the high inspection gallery. We do not engage him from the floor where he can reach the keystone. Devran, you take the crowbar. I take his arms. Tarik, your only task is to secure that arch before the friction fails."

"The inspection gallery is barely eighteen inches wide," Devran said, swallowing hard. "The drainage flood from the sluice is running ten feet below it. If a man loses his balance in the dark, the current sweeps him straight into the iron trash racks of the lower sump."

"Then keep your boots against the wall and do not lose your balance," Aysun-bek said.

Yasar-tay tapped his stave against the threshold, a dry rattle escaping his throat. "A blind guide, a disgraced surveyor, an iron commander, and a frightened corporal walking a greasy ledge over a roaring cesspool. If the Emperor had half as much courage as this expedition, the Line would have reached the ocean."

They descended the narrow spiral stairs behind the armory vault, leaving the dry basalt behind and stepping down into the cold, dripping darkness of the deep foundations.

The temperature plummeted immediately. The air here was dense with the smell of brine, sulfur, and stagnant canal mud, laced with the sweet, sickening aroma of decomposing bone. Below them, the roar of the flooded drainage conduit echoed through the narrow stone shaft—a heavy, churning rumble that made the granite steps tremble against their boots.

Tarik led the way along the high inspection ledge. The ledge was a narrow shelf of rough-hewn stone cut into the wall ten feet above the rushing torrent, built centuries ago for masons to check the expansion joints after seasonal floods. It had no handrail, no safety chains, and the surface was slick with a greasy film of mineral slime that smelled of old salt.

Tarik moved with deliberate, measured steps, keeping his left shoulder pressed firmly against the weeping wall. His scarred fingers trailed along the mortar lines, feeling every ridge and void in the dark. With every ten paces, he paused, listening past the thunder of the water for the sound of metal against stone.

Ahead, where the conduit curved sharply toward the western bastion, a pale, sulfurous green luminescence washed across the ceiling arches—the cold, chemical glow produced by mixing powdered brimstone with canal moss, favored by miners in deep shafts where open fire would ignite marsh gas.

Aysun-bek raised her hand, flattening her palm against the stone behind Tarik’s back.

Tarik leaned forward, easing his head around the corner of a massive granite corbel.

The keystone chamber was a vast, octagonal pocket carved directly out of the living bedrock, suspended over the roaring sluice channel. The walls were lined with massive, rust-colored ashlar blocks, glistening with water that wept from every vertical joint. High in the center of the vault hung the Salt-Glaze Keystone—a massive, wedge-shaped monolith of black diorite, five feet long and three feet across, locking the heavy ribs of the western curtain into a single, terrifying arch of compression.

Beneath the keystone, balanced on a narrow scaffolding timber laid across the roaring water, stood Lieutenant Berkan.

The lieutenant had stripped off his heavy officer’s coat and tunic; his linen undershirt was soaked with black slime and torn open at the chest, revealing pale skin covered in a mottled, gray rash that looked like drying cement. His bare hands were blackened, the fingernails ripped entirely away from the nail beds, leaving raw, bloody flesh that he pressed against the rough stone without the slightest sign of pain.

Working without a hammer or chisel, Berkan had driven a heavy iron pry-bar into the vertical bedding joint along the left flank of the diorite keystone. With his bare left hand, he scooped great fistfuls of grayish, steaming paste from a leather bucket and forced it deep into the opening, packing it into the structural void with frantic, rhythmic thrusts of his fingers.

Then, leaning forward until his forehead touched the weeping rock, the lieutenant pressed his open mouth against the seam.

Tarik felt the hair rise on the back of his neck.

Berkan scraped out the void with frantic hunger, sucking the original hydraulic mortar directly from the joint and using his teeth to strip the ancient lime from the granite faces, spitting gray rubble down into the water below before shoving another fistful of bone-ash paste into the empty socket. His jaw worked with a rapid, mechanical ferocity, his molars grinding against the stone with a wet, sickening crunch that carried clearly above the roar of the torrent.

Devran let out a strangled gasp, his knuckles turning dead white as he pressed himself back against the damp wall. Aysun-bek did not make a sound, but her broadsword lifted two inches, the corroded steel catching the pale green glow of the chamber.

Tarik leaned back toward Aysun-bek, his voice a breathless murmur against her ear. "He has cleared four inches of the bedding seat along the south flank. The paste he is packing around the gap is dense bone-ash and lye to tamp the void so the concussion cannot vent sideways."

"How long do we have?" she whispered.

"The seating is almost ready," Tarik said. "Once he drives the charge home, any spark will drop the entire vault."

"We drop from the corbel," Aysun-bek said, her voice hard as iron. "Devran takes the timber and sweeps him off the plank before he reaches for a striker. I secure his arms. Tarik, your only task is to kick the powder firkin into the current and drive the oak wedges into the void before the stone settles."

Tarik looked down again, his eyes sweeping across the wet scaffolding board, and felt a cold knot tighten in his gut.

Beside the leather bucket of bone-ash sat a small, iron-bound wooden firkin, its bung sealed with bright red sealing wax, and a long coil of braided hemp soaked in yellow sulfur. The red wax marked it as imperial heavy blasting powder.

Seeing the powder and the sulfur fuse, Tarik understood the full scale of the sabotage. Berkan was not merely relying on the slow creep of water vibration to shear the arch. He was preparing to blow the entire keystone out of the ceiling.

The lieutenant stopped his frantic chewing. He pulled his head back from the stone seam, his face smeared with gray sludge and blood from his torn gums. His eyes, milky and wide with the opaque haze of the bedrock rot, stared blankly up at the black diorite keystone above him.

Then, in the cold, echoing stillness of the vault, the lieutenant began to sing.

His voice was hoarse, raspy from swallowing crushed stone and lye, but the cadence was steady, rhythmic, and ancient. The melody carried the cadence of the founding guild—the very mason’s work-chant Master Mason Oruç had hammered out on his iron chisel three centuries ago when Evren-oglu laid the first course of ashlar into the bleeding bedrock of the Qiziltay Line.

The stone takes the bone, Berkan sang, his voice rising in an eerie, melodic swell that made the masonry ring. The lime takes the blood. What was laid in the dark shall break in the flood.

He wedged the iron-bound firkin directly into the excavated void beneath the diorite block, then carefully threaded the sulfur-soaked hemp through the powder bung. He did not reach for his striker yet. He sat back on his heels upon the narrow scaffolding plank, his bloody fingers resting flat across his knees, humming the low, rhythmic measures of the builder's hymn into the roaring dark as if waiting for the third watch bell to mark his hour.

Above him on the high gallery ledge, Tarik leaned back against the weeping rock. The ancient cadence vibrated through the granite into the bones of his spine—a design carved into the stone three centuries ago, waking in the flesh of the garrison. The Line had been raised with its own delayed collapse sealed into its ribs.

Aysun-bek reached down, took a heavy oak wedge from Devran's satchel, and pressed it into Tarik's palm. The wood was cold and seasoned, dense enough to take a sledge blow. Her gaze held his in the sickly sulfur light, silent and absolute.

There would be no retreat to the Spire, and no appeal to high command. When the third bell tolled, the choice would be measured in steel and falling diorite.