Gears froze, his hand hovering two inches above the leather roll on his belt. The brass hurricane lamp hooked to his hip swung back and forth, painting wild, distorted arcs of light across the wet iron wall of Shaft 9.
"I—I didn't open it, Danial!" Gears stammered, his voice cracking as he looked up into the blinding beam of Danial's lantern. He quickly slammed both hands back onto the rusted iron rungs, holding on so tight his knuckles went paper-white. "I swear on my mother's life! I saw two Enforcers down at the Level 4 bypass yesterday morning before the blast gates fell! They had a brass key manifold and a full tool chest!"
Maya leaned around Danial's shoulder, her eyes burning with suspicion in the dim lamplight. "Enforcers didn't come down Shaft 9, Gears. The hatch was sealed from the inside. You need a maintenance key just to throw the deadbolt."
"They didn't use Shaft 9!" Gears insisted frantically, his breath coming in fast, shallow gasps as hot geothermal steam swirled around his legs. "They used the upper service conduit near the old water works! They were checking the pressure release valves on the main drainage line! If they opened that hatch, they were probably trying to vent steam up into Sector 4 to clear the lower levels before the lockdown! Ask Oakes if you don't believe me—the Directorate bypasses all loop together down here!"
From fifty feet above, Old Oakes's voice boomed down through the iron shaft, muffled by steam and distance. "What's the holdup down there, kids? The winch brake is heating up! Keep moving or we'll be floating on grease!"
Danial stared down at the trembling boy. The explanation was smooth—almost too logical for a seventeen-year-old apprentice caught fifty feet above a three-hundred-foot drop. It accounted for the access hatch, the fresh tool marks, and the timing. But it didn't account for the chipped carbide shear mark at Node 2, nor did it explain the blue enamel paint on Gears's boots.
He's terrified, Danial thought, studying the wild jitter in Gears's pupils. Not just of falling. He's terrified we're going to search his coat.
"Keep climbing," Danial said softly, his voice a flat, unreadable wall. "If that valve was turned, the pressure in the lower sump is going to be erratic. We need to reach the floor before the steam locks up the transport cable."
Gears let out a ragged breath, nodding frantically. "Right. Right. Ten more meters to the staging catwalk."
He turned and scrambled down the remaining rungs with desperate speed, his heavy steel-toed boots—Oakes's boots—clattering against the iron frame until his feet struck solid concrete below.
The bottom of Shaft 9 opened into a chamber that dwarfed anything Danial had seen in the upper levels of Sector 4.
The Forgotten Pumpworks.
It was a cavernous, cathedral-like vault of Victorian masonry and massive iron girders, built eighty feet below the city's living quarters. High above, the vaulted ceiling vanished into a dense, hanging fog of white geothermal steam that billowed continuously from deep wall fissures.
The air was heavy, hot, and thick with the suffocating stink of sulfur and wet copper. It felt like standing inside the lungs of an ancient steam monster. After the bone-chilling frost of the upper conduits, the sudden heat hit like a wet blanket, sticking wool shirts to sweaty backs within seconds.
"Faugh," Maya choked out, coughing into her sleeve as her boots hit the deck. "It smells like a copper smelter's slag heap down here."
"Sulfur and Selar runoff," Danial said, lowering his lantern. "It means the geothermal core is active."
Half the pumpworks was completely submerged. A vast, black subterranean lake covered the stone floor, its oily surface reflecting the pale yellow glare of the single lantern mounted on the transport platform. Rising out of the dark water like rusted iron monuments were three massive, two-story-tall beam engines—their heavy flywheels and piston shafts locked in decades of silent, corrosion-crusted sleep.
CREAK... SPLASH.
The wooden transport platform touched down with a heavy, wet thud on a narrow, raised stone quay that jutted out into the black water.
Old Oakes swung down from the ladder frame a moment later, his boots splashing into two inches of oily bilge. He immediately unhooked his brass lantern and held it high, gazing up at the towering steel monoliths with a mix of awe and profound sadness.
"The Directorate's iron heart," Oakes whispered, his voice echoing hollowly through the cavernous vault. "Built in '82 to keep the lower coal seams from drowning. Beam Engine Number One, Number Two, Number Three. When the freeze came, the Council shut off the coal boilers and let the water take 'em. Never thought I'd stand under these flywheels again."
"Did your father work on these, Danial?" Maya asked, stepping carefully along the slimy edge of the quay, her hand resting on her heavy brass wrench in her coat pocket.
"He tried to turn them back on during the Great Freeze five years ago," Danial said, stepping up to the edge of the water. "The Council cut his funding before he could clear the intake valves. They said Sector 4 wasn't worth the coal."
Maya stepped off the ladder, unbuckling her heavy tool apron. She wiped a stream of sweat from her forehead, her hair already plastered to her cheeks by the thick, tropical humidity. "It must be eighty degrees down here. Where is the vent?"
Danial unrolled his father's map across a dry wooden crate near the transport platform, weighing down the curled edges with two heavy brass wrenches. He pointed to a narrow stone archway at the far end of the flooded quay—an archway choked with tangled iron pipes and glowing with a faint, eerie blue light.
"Through the main filtration corridor," Danial said, tracing the ink line. "The Geothermal Vent sits directly beneath Pump Number Three. If we set up Node 4 at the manifold head, the natural heat from the earth's mantle will superheat the Selar core without needing coal."
"And the lead-acid batteries?" Gears asked, stepping up beside the wooden platform, his eyes darting toward the six blue storage arrays stacked on the timber deck. He looked eager—almost too eager—to start hauling gear. "We haul 'em down the quay?"
"We move two at a time," Danial said, watching Gears carefully. "Oakes, you and Gears take the first cable reel and Array One. Maya and I will secure the secondary junction box."
"Got it," Gears said, grabbing the iron handle of the first blue battery. "Let's get 'em off the wood before the humidity gets into the dry terminals."
He bent down to lift it—and suddenly stopped dead in his tracks.
The oil-slicked surface of the black subterranean lake gave a sudden, unnatural ripple.
THUMP.
It wasn't a sound from above. It was a deep, low, sub-audible vibration that rattled through the stone quay, vibrating straight through the soles of Danial's boots and into his teeth.
THUMP... THUMP.
Oakes froze, his hand resting on the battery casing. "What in the hell was that? An airlock cycling up on Level 5?"
"No," Maya whispered, backing away from the water's edge, her lantern beam shaking as she swept it across the black surface. "A water hammer? A steam surge in the intake pipes?"
"That's not steam," Danial said, his eyes widening as he watched the water line against the quay. "The water's rising."
THUMP-THUMP-THUMP.
The ripples on the subterranean lake grew violent, slapping hard against the mossy stone quay.
Then, from the shadows behind the rusted flywheel of Pump Number One, a thick, jet-black stream of water erupted upward with a violent, deafening hiss.
It wasn't a geothermal vent. It was hydraulic pressure—massive, crushing force being pushed through the main intake conduits from the south.
"That's not a leak!" Danial yelled over the sudden, roaring rush of water. He lunged forward, grabbing his father's map and shoving it into his satchel as the water level on the quay rose two inches in five seconds. "Someone opened the primary floodgate in the Upper Reservoir!"
"The Council!" Oakes roared, his voice barely audible over the deafening cascade. "They're dumping the upper drainage reserves down into the Sump! They're trying to drown the pumpworks before we can light Node 4!"
"The batteries!" Maya screamed, pointing at the transport platform as a three-foot wave of dark, ice-cold water washed over the quay, smashing into the wooden crates.
The heat of the geothermal vault was suddenly shattered by a rushing torrent of sub-zero glacial runoff pouring down from the upper city. The sudden collision of freezing water and scalding geothermal air triggered a violent thermodynamic reaction.
A massive, blinding wall of white condensation exploded into the room, obliterating all visibility in a fraction of a second.
"Maya! Oakes!" Danial shouted, blinded by the dense fog, his boots slipping on the flooded quay as cold water surged up to his knees. "Grab Array One!"
He lunged through the white fog toward the transport platform, his hands scrambling in the dark for the heavy lead battery handles.
SNAP-CRACK.
Through the roaring rush of water and the blinding steam, a sharp, distinct metallic sound echoed from the shadows right beside the platform cable—the unmistakable sound of high-density carbide shears biting through a heavy braided steel wire under tension.
The transport platform groaned violently, tilting sideways as one of its main support cables snapped.
"Danial!" Maya yelled through the white wall. "The cable's cut!"
Danial wiped steam from his eyes just in time to see a dark silhouette leaping off the tilted edge of the platform, splashing heavily into the rising water near the far stone archway.
It was Gears. In his right hand, reflecting the faint blue glow of the distant vent, was Oakes's tool roll.
"Gears!" Danial shouted.
The boy didn't turn back. He ducked into the flooded filtration corridor, vanishing into the glowing fog toward the Geothermal Vent.