Bursting of the Bilge Iron

Steam hissed against the cold limestone ceiling in scalding plumes, turning the air in the Level 2 guardroom into a damp fog that tasted of boiled swamp grass. Garret Vane stood knee-deep in murky backwash, boots planted against the flags while he gripped the haft of a broad-bladed timber-ax. He wanted the floor cleared and the iron stair wicket ready to drop before the blistered hatch blew its oak harness. Every groaning rivet told him the braces would not survive another surge.

\"Get the last coil of hemp up the spiral!\" Garret shouted through the vapor.

Across the chamber, Corporal Gable shoved a soaked tallow crate onto the lowest step. \"The stairwell is choked with smoke from Tamsin's sulfur braziers,\" Gable called back, wiping yellow spray from his beard. \"Murrough says the archers are vomiting on the third landing.\"

\"Let them vomit on dry stone,\" Garret barked. \"Move the iron!\"

Norris Claver stood perched on an upturned mortar trough near the western wall, holding an oil lantern above his head like an anchorite in a flooded crypt. His spectacles were opaque with condensed steam. \"The tensile strength of low-grade charcoal iron drops forty percent once metal reaches boiling heat,\" Norris yelled, his voice cracked with terror. \"The center seam isn't shearing. It's yielding plastically! The rivet shanks are elongating under the heat!\"

\"Shut your mouth and take the stairs, Norris!\" Garret warned.

Before the mason could step down, the steps above creaked under a rush of skirts. Tamsin Lowery hurried down the spiral stairs, gray wool apron hiked into her belt. Her knuckles were bruised purple, and both pockets of her apron dragged against her thighs, weighed down by the pair of weeping basalt stones pulled from the sentries' jaws.

\"Garret!\" she called out, stopping three steps above the water. Her gaze fixed on the bulging plate. \"Halen spoke before the fit passed. He says the lady wants her bridegroom before the midnight bell rings out over the gorge, or she dissolves the piers to silt.\"

Garret did not look up from the iron. \"The windlass clock on the parapet keeps watch-time, Tamsin, not witch-time.\"

\"She doesn't need our bronze to keep time,\" Tamsin said, her voice dropping into a harsh rasp.

Beneath the floor, the deep thrumming pulse that had vibrated through the foundation since nightfall abruptly died.

The silence that followed fell sudden and hard, hollowed of sound except the distant cataract outside the arrow slits. Even the spray whistling through the rivet holes choked off.

Norris lowered his lantern. \"A negative pressure differential. The hydraulic head in the well flue just dropped ten feet.\"

\"Get up the stairs!\" Garret yelled, lunging toward Tamsin. \"Run!\"

The well didn't drain; it loaded.

A muffled detonation hammered through the foundation ashlar, shaking the four-foot walls so violently that mortar dust showered from the vaulting. Between the two white-oak transverse balks, the iron blister ruptured with a crack like an exploding cannon barrel. Jagged shrapnel struck the ceiling, ricocheting through the dark and splintering the wooden racks.

A geyser of boiling, curdled river water roared eight feet into the air. It came up pale, thick as buttermilk, foaming with sweet yellow froth and scalding steam.

The first oak stringer snapped clean across its heartwood, split end over end by the upward thrust. The forged iron bracket tore out of the wall with a shriek of masonry, pulling two granite corbels straight from the bedding.

The flood hit Garret at waist level. The surge knocked his bad leg out from under him, throwing him against the central pillar. The water was fever-warm, slick as lard, smelling intensely of crushed pond lilies, marsh mire, and decayed river moss.

\"Norris!\" Garret coughed, spitting a mouthful of the nauseating brine.

The mason had been swept off his trough, flailing in the current as his spectacles floated away on the foam. Garret lunged against the boiling drag, caught Norris by the collar of his leather jerkin, and shoved him bodily toward the spiral stairs.

\"Up! Don't look back!\" Garret yelled.

Norris scrambled onto the bottom tread on hands and knees, retching. \"The dogs sheared!\" the mason wheezed, fingernails digging into the limestone. \"High-sulfur pig iron from the east foundries! I told the aldermen twelve years ago that pig iron rots under sulfur steam!\"

\"Gable, haul him!\" Garret shouted.

Gable reached down from the second turn, catching Norris by his belt and dragging him onto the dry steps where Elspeth and the surviving archers waited.

Tamsin held her ground on the third riser, fingers gripping the stone jamb. \"Garret, take my hand! Get out of the basin!\"

Garret turned to wade toward the steps, but something struck the surface behind him with a heavy splash.

Rising through the boiling foam of the open hatchway came a pale, bloated figure.

It was Vaneen Cleary. The young sentry who had vanished into the flooded sump when the lower cellar breached was no longer the boy who whistled ballads across the muster table. His kettle-hat was gone, his hair matted into thick ropes of green river-weed trailing over bare shoulders. Stiff river-reeds sprouted directly from the tears in his gray tunic, their pale roots digging into the waterlogged flesh of his collarbones.

His eyes were wide open, pale blue and unfocused, catching the lantern light with an eerie sheen. Across his white face stretched a broad, serene smile.

Cleary's water-softened fingers broke the surface and locked around the cuff of Garret's right boot.

The grip was not the frantic clawing of a drowning man. It was deliberate, heavy as an iron anchor, pulling Garret downward toward the open shaft with cold, inexorable force.

Garret's bad ankle twisted under the drag. Pain flared up his calf, hot and sickening, as the warm water climbed toward his ribs.

If I go down the shaft, the door stays open and the stairs take the river.

Garret twisted his torso against the current, his good foot wedged into the corner of the stair threshold. He swung the broad-bladed timber-ax downward with both hands.

The blade sheared through the tangled reeds and bit into Cleary's bloated forearm. No red blood welled from the cut; thick, yellow-green sap oozed into the flood, smelling faintly of crushed fennel. Cleary did not flinch, did not scream, did not break his tranquil grin. But the severed tendons lost their leverage, and the cold fingers slipped from Garret's leather boot.

Garret scrambled backward onto the bottom step, dragging his bruised leg clear of the foam.

\"Drop the wicket!\" Gable screamed from the landing above.

Ten feet above the floor, the heavy iron wicket gate hung in its stone wall-grooves, held by a thick hemp cable running through an overhead pulley into the counterweight flue. In dry years, three men worked the hand-crank to ease the bars down. Now, the rising flood had swamped the lower winch cradle, and the swollen hemp had jammed inside the iron sheave.

Garret lunged up to the second tread. He braced his shoulder against the spiral core pillar, gripped the timber-ax, and swung upward at the tension cable.

The heavy steel bit deep into the braided hemp. Sparks flashed where the ax struck the pulley rim. Strands parted with sharp cracks.

On the third blow, the bridle severed.

The twenty-four hundredweight of lead ballast dropped down its chase, and the iron wicket plunged along its stone channels like a falling guillotine.

The bottom bar crashed into the stone sill with a deafening clang, throwing spray up the stair shaft. The forged vertical bars, spaced four inches apart and three inches thick, locked solid across the throat of the spiral staircase.

Garret dropped the ax onto the tread, his hands shaking as he gripped his bruised knee.

\"Up, Garret,\" Tamsin urged, grabbing his jerkin to haul him onto his feet. \"The water is rising through the sills!\"

Together, they scrambled up the winding limestone steps, past the second turn where the stone was cold and dry. On the landing of Level 3, Corporal Gable and Elspeth held lanterns above the stairhead, flanking Norris and the shivering archers. From Tamsin's apron pocket, icy water dripped onto the dry threshold.

Garret leaned against the landing jamb, looking down the spiral well.

Thirty steps below, the Level 2 guardroom was entirely gone. Warm, milky water surged to waist depth, lapping against the locked iron wicket. The oak muster table floated upside down among smashed racks and drifting straw.

Then, through the green swell on the other side of the grating, something pale drifted toward the bars.

Vaneen Cleary's drowned face rose to the surface of the pool. His hair drifted around his ears like dark weeds in a millpond. He pressed his cheek against the cold iron bars, his pale eyes staring straight up the stair shaft toward the lantern light, his lips parted in that same quiet, impossible smile while pale green reed tips swayed gently between his teeth.