Submerged

A brass horn groaned across the dark water, three short blasts followed by the heavy clank of iron portcullises dropping along the canal walls. The sound traveled straight through the granite slipway timbers, vibrating against Fumitaka’s boots before the echo finished in the night air. A Sector Four sweep was not scheduled until fourth bell, which meant someone on the high crane rail had already talked.

Fumitaka shoved the canvas roll of lodestone rods into the recess behind the false keel timber. He did not curse. Anger wasted breath, and breath was the only resource they could not buy from the quartermaster.

"Master," Genzo whispered, his voice rising toward the crane housing. His fingers clawed at the wet hemp sling holding their tool cradle. "That was the Provost horn. The triple blast. Three means no clearance out through the lock-gates. Three means they bring the dogs and the long iron gaffs."

"Shut your mouth," Fumitaka said, his voice flat and low. "Take the lead weights. Lash the four-inch copper plates under the lower staging beam. If metal rings against stone, you will hang before the tide turns."

Genzo fumbled with the greasy hemp cord, his hands shaking so violently the copper washers chattered together. "The salt water is black as squid ink tonight. If we go under the cradle, the drowned dock-things—"

"Take the cord," Fumitaka said, shoving the heavy coil into Genzo's chest. "Or I leave you on the gantry for the marines."

Genzo choked down his panic and dropped to his knees on the slick pine planking.

Fumitaka worked with practiced economy. He wrapped the heavy copper plates in greasy tallow cloth to deaden any scrape against the granite cradle. He looped lead lines around the copper slabs, binding them flush to the submerged oak deadwood beneath the waterline. Hydro-magnetic plates needed salt water to hold their acoustic charge, but an inspector’s lantern would catch the reddish sheen of bare metal if a single corner poked above the harbor scum. He checked the knots with his scarred thumbs, testing the tension twice in the dark.

Lantern light spilled across the high rim of Slipway Four.

Iron-shod boots struck the granite quay sixty feet above them. The rhythm was steady, deliberate, and backed by the clatter of marine muskets.

"Down," Fumitaka commanded.

"Master, the cold—"

Fumitaka grabbed the back of Genzo’s collar and forced the apprentice backward off the staging. They slipped into the freezing brine without a splash, sliding beneath the moss-slick bellies of the keel blocks.

The harbor water hit Fumitaka's chest like an iron band. It was thick with bilge runoff, coal slag, and decomposing sea kelp. He caught the lower edge of an oak rib with his left hand, locking his fingers into a gap between the barnacle crusts. With his right hand, he dragged Genzo down into the pocket of darkness beneath the frigate’s bilge keel.

Above them, bright yellow beams of lantern light cut through the cracks between the drydock staging planks.

"Check the lower cradle," a sharp, clipped voice rang out from the pier. The voice carried the cold precision of naval provost administration. Captain Satoru stood on the granite edge, his brass-trimmed coat casting a rigid shadow across the water. "The informant on Crane Two reported unauthorized mallet strikes beneath the garboard seam. Look for fresh pine shavings and pitch buckets."

"Sir," a marine called back from the gangway. "The slipway gate is locked from the outside. The tide is three feet above the apron."

"Check it anyway," Satoru ordered. "Smugglers work with their noses under the scum. Bring the long iron hooks and drag the bilge slots."

Fumitaka kept his head tilted backward beneath the timber overhang. Only his mouth and nostrils broke the scum-filmed surface, tucked into a two-inch pocket of air trapped between the hull and a massive oak beam. The rest of his body hung submerged in the numbing salt tide. Beside him, Genzo’s teeth clicked together like dry dice.

Fumitaka reached through the black water and clamped his fingers over the boy’s jaw, squeezing hard enough to bruise the bone. Genzo went rigid.

A heavy iron gaff plunged into the water six inches from Fumitaka’s knee. The steel barb dragged through the seaweed, scraping along the copper-bronze keel bolts with a dull, muffled shriek.

Fumitaka did not flinch. He measured the stroke of the gaff. Three feet down, a pause, then a sweep toward the stone footing. The marine holding the pole was tired, leaning his weight onto the timber railing with each thrust.

Above, the boots paced along the staging. Satoru’s heels struck the pine planks directly over their heads. Pine resin and dry sawdust drifted down between the gaps, falling onto Fumitaka’s wet hair.

"Nothing on the outer cradle, Captain," the marine reported, hauling the dripping gaff back up. "Just old barnacles and green slime. No fresh pitch in the water."

"Look at the staging bracket," Satoru said. "The iron clamp on the third timber is wet. The tide hasn't reached that height since yesterday's noon bell."

Fumitaka’s grip on the timber tightened. The cold had settled deep into his shoulder joints, turning his old caulking scars into bands of fire. If Satoru ordered the basin drained by the sluice valve, they would be trapped against the granite floor within five minutes.

Genzo shifted his weight. In his attempt to pull his shivering knees tighter against the dock wall, the apprentice's canvas pouch caught on a submerged iron ring bolt anchored to the submerged masonry.

A sharp metallic clink sounded against the granite.

The heavy brass acoustic tuning fork—the precision instrument Daigo had provided to measure the copper hull’s resonance against the granite veins—spilled from the torn pouch seam. It struck the submerged granite footing just inches below the waterline and rang against the stone with a sustained, piercing note that resonated through both water and air.

Fumitaka reached through the dark water, his numb fingers raking across the slippery moss, but missed the fork as it settled on the shallow stone step.

The sharp ring of high-grade acoustic brass cut cleanly through the damp air of the dock.

Silence fell across Slipway Four.

The boots on the planking above stopped instantly.

"What was that?" Satoru asked.

"A dropped bolt, maybe," a marine muttered. "The dock timbers are settling."

"Timbers do not ring at a sustained naval pitch," Satoru said.

The lantern light shifted. Footsteps descended the narrow iron ladder from the staging down to the water ledge. Fumitaka pulled Genzo deeper into the shadow under the oak keel, sinking his chin until the brackish brine touched his lower lip.

A brass lantern descended into view. Captain Satoru’s polished black boots stepped onto the wet stone footing. The provost commander knelt, his gloved fingers reaching down into the shallow brine over the submerged stone step. He lifted the dripping brass fork, turning it in the lantern beam.

"Solid naval bronze," Satoru murmured, running his thumb over the engraved calibration marks along the fork's stem. "Tuned to four hundred vibrations per second. This is not a carpenter's tool."

"A deserter's gear, sir?" the marine asked from the ladder.

"No," Satoru replied, his voice hardening into steel. "This is an acoustic resonance key. Someone is attempting to tune a kinetic array inside our drydocks."

He stood up and tapped the brass fork against his iron sword hilt. The clean, pure ring echoed through the entire slipway, humming through the water around Fumitaka’s ears.

"Double the marine cordon around Sector Four," Satoru commanded, turning toward the ladder. "Post four marksmen on the crane gantry. Seal the outer sluice gate. Nobody enters or leaves the lower canal until we turn this entire basin inside out."

The provost's footsteps climbed back up the iron rungs. Above them, the heavy dock gates slammed shut, and the iron chains began to rattle.