Resonance and Iron Glass

Could a three-ton hydrofoil skimmer running on a single foil outturn an autonomous seismic torpedo before the warhead reached Lock Seventeen’s foundation sill? Boróka Nyáry shoved Csóka’s twin throttles forward against the brass stops, aiming the skimmer’s shuddering bow straight through the narrow arch of the sunken belfry toward the primary spillway channel. She did not need Warden Csortos to surrender or agree. She needed thirty yards of clear water between her transom and the armored prow of Holló-04 so she could lay a firing line directly into the incoming weapon’s acoustic cone.

"Turn her around!" Erzsébet shouted from the port co-pilot jumpseat, bracing both grease-blackened forearms against the instrument rail. "Boróka, the steering knuckle is cracked three ways to Sunday! If that intake picks up silt at full draw, we won't need a torpedo to drown us. We'll flip on the displacement flat and save the Continental Treasury our fuel tax!"

"Prime the booster coil, Auntie Erzsi," Boróka answered without looking back. She yanked the salt-encrusted electrolyte flask from her harness, pulled the rubber stopper with her teeth, and forced a swallow of bitter potassium gel down her raw throat. The cold sting bit into her parched pharynx, shocking the nerve nodes along her collar back into conductive focus. "He won't kill the harbor lights. If we don't break that guidance head in open water, the whole basalt shelf goes into the sea."

Across fifty yards of frothing churn, the searchlight from Holló-04 swung hard to port, spearing through the rain and blinding Boróka’s forward view.

A sharp, statutory whistle split the wind: one short blast, one long, then two rapid bursts from the patrol cutter's brass steam horn.

"Vessel Csóka," Vencel Csortos’s voice thundered through his deck megaphone, crisp and mechanical over the crashing surge. "Under Article Thirty-Eight of the Navigation Code, you are maneuvering in restricted approach waters without operational steerage. Stand off the channel axis immediately or assume full liability for imminent collision!"

"He's citing collision statutes," Erzsébet said, her voice deadpan as she threw the toggle switches on the galvanic bus. Sparks sputtered green behind the frosted dial faces. "God help us, the world is ending and the man is filing a lane-departure report."

Boróka leaned hard on the rudder helm. Without the port hydrofoil, the skimmer skipped unevenly over the incoming swell, its starboard blade carving deep into the black water while the sheared hull slammed down with bone-jarring concussions. "Clear the stern deck! I need line-of-sight to forty fathoms!"

A dull, rhythmic thrum vibrated up through the aluminum plating under her boots. It was not the engine, and it was not the rush of the sluice.

The hydrophone needle pinned itself against the far right pin. A high-pitched, metallic squeal tore through the acoustic pickups: 1,800 Hertz, pulsed in three-quarter-second intervals.

The torpedo had cleared the outer reef.

"Hydrophone tracking," Erzsébet called out, her fingers flying over the tuning drums. "Speed forty-two knots! Depth eight fathoms and rising! It's locked on the lock's south beacon array, Boróka! Bearing dead ahead on our starboard quarter!"

Boróka kicked open the cockpit hatch and hauled herself up into the lashing spray of the open deck. The wind whipped rain across her eyes, stinging her skin with North Shelf salt. Ahead, beyond the limestone arches of the drowned belfry, the colossal black monolith of Lock Seventeen towered into the night sky, its green and amber navigational lights blinking in methodical, indifferent pulses.

Between the skimmer and the great wall, the surface of the channel split.

A furrow of pale, luminous froth ripped across the dark water at horrifying speed. Beneath the spray ran the blunt, beryllium-bronze hull of the seismic torpedo, its dorsal fin trailing an envelope of supercavitating gas. It moved like an iron spear drawn inexorably toward the beacon tower.

"Holló-04 is closing!" Erzsébet yelled through the hatch.

Boróka glanced back. The heavy patrol cutter was surging through the gap between two flooded gothic buttresses, its twin diesels roaring at redline. Vencel stood upon his open bridge wing, his slate-gray coat drenched black by the rain. But he was not preparing to ram. His gray eyes were fixed not on Csóka, but on the boiling wake of the incoming weapon.

His boots clamped to the non-skid plating, Vencel raised both palms toward the water.

The air above the channel thickened. Raindrops froze in mid-flight, their downward arcs flattening against an unseen wall of compressed atmosphere.

"Warden!" Boróka screamed against the storm, tapping the silver terminals of her acoustic collar. "Hold that barrier! If you drop it before I hit the dome, the shockwave will crush your hull like an oil drum!"

She did not wait to see if he heard her. She dropped to one knee on the shuddering transom, locked her boots into the welded deck rings, and rested her jaw against the collar's vibration pickup.

The torpedo was three hundred yards out, closing at over seventy feet a second.

Her trained ear caught the acoustic Doppler shift of the weapon's homing ping: 1,814 Hertz rising against the opposing current. The guidance package sat behind a hemispherical plate of case-hardened beryllium bronze. At that thickness, brute force was useless; a general concussive blast would glance off the curved alloy and detonate the primary seismic core prematurely. She had to locate the resonant frequency of the transducer mount itself—the tiny, three-millimeter ceramic bracket securing the hydrophone array inside the nose cone.

Boróka drew the freezing sea air deep into her lungs, packing the breath against her ribs until her diaphragm locked tight.

She opened her mouth and sang.

The note was not music. It was a vicious, laser-narrow screech of acoustic power, pitched at an agonizing high-C harmonic that sliced through the engine rumble.

The bio-synaptic cells along her scarred laryngeal collar flared white-hot under her skin. The agony tore down her neck into her chest, sharp as swallowed glass, but she tightened her stomach muscles and forced the sound forward through her teeth.

The acoustic beam struck the water sixty yards ahead of Csóka. A needle-thin waterspout geysered into the air, vibrating at seventy thousand cycles per second.

The torpedo’s dorsal wake swerved.

The acoustic pulse caught the nose cone. Through the soles of her boots, Boróka felt the vibration register—a crisp, brittle snap transmitted through forty fathoms of saltwater. The ceramic mounting bracket inside the nose fractured. Deprived of its acoustic bearing, the torpedo’s forward guidance hydrophones failed instantly.

The weapon’s proximity arming circuits tripped into defensive override.

A blinding flare of white light illuminated the rain, followed by the deep, hollow roar of an underwater detonation.

Fifty thousand pounds of shaped cavitation explosive ignited two hundred yards short of the lock gate.

A dome of black water and superheated steam erupted toward the clouds, lifting a colossal shockwave that tore across the surface like an iron rake. The blast flattened the chop, turning the channel into a rushing wall of concussive fury.

"Brace!" Boróka barely managed to gasp, her scorched throat producing only a bloody croak.

From thirty yards away, Vencel Csortos thrust both fists forward.

The air between the two vessels groaned. A vertical sheet of telekinetically compressed water and air crystallized into place—a translucent shield six inches thick, shimmering like solid bottle-glass across the entire breadth of the channel.

The shockwave slammed into the barrier.

The sound was like an anvil struck by a locomotive. The density wall flexed, bowed inward, and turned milky white with spiderweb fractures as it absorbed hundreds of tons of hydrostatic pressure. Across the gap, Boróka saw Vencel’s knees buckle. Blood welled from his nostrils and dripped from his clenched lips as the tremendous kinetic inertia hammered back into his muscular frame. Yet the warden remained upright, his jaw locked, refusing to yield an inch of the defensive perimeter.

The shattered remnants of the shockwave spilled around the barrier’s edges.

A tumbling crest of frothing backwash caught Csóka’s flat transom, lifting the skimmer bodily into the air. The skimmer’s remaining turbine screamed in agony as the propeller left the water, seized on displaced air, and shattered its primary drive shaft with a catastrophic metallic snap.

The skimmer came down hard on the submerged limestone ledge of the lock's spillway sill, grinding aluminum across ancient stone.

Ten feet to port, Holló-04 followed, her heavy steel keel plowing through the shallows with a screech of peeling hull plate before wedging tight against the massive concrete apron.

Then the roar died away.

The towering plume of displaced seawater rained down in heavy, drenching sheets, pattering softly against the smoking metal of both decks. Plumes of white steam hissed from Csóka’s ruptured turbine manifold into the cold night air.

Boróka lay sprawled across the aft plating, her chest heaving, the taste of salt and copper heavy on her tongue. Her collar battery pulsed a faint, dying amber light.

Across the ten feet of dark, shallow foam separating the two grounded craft, Vencel stood leaning heavily against the twisted railing of his cutter, his slate coat torn at the shoulder, breathing in ragged, measured gasps.

Neither vessel moved. The shattered guidance fin of the torpedo floated past between them in the dark water, spinning gently in the quiet surge.