The water hit Daxian's chest like a block of ice.
He broke the surface coughing, his left hand clawing at the slick, curved wall of the pipe to keep his head above the rising line. The chemical fluid was pouring in from the overhead vents at three times the previous rate, turning the seventy-foot sealed chamber into a pressurized tank. Every time he took a breath, the vaporized copper burned his throat, leaving a bitter, metallic taste that made his chest heave.
"Vesper!" he shouted, his voice muffled by the roaring rush of the inflow.
"Up here!" her voice came from the ceiling.
She had jammed her iron sorting rod completely across a pair of heavy structural brackets near the roof, hoisting her body onto the narrow ledge. Her canvas pouch was soaked, dripping dark fluid onto the churning surface below. She looked down at him through her cracked goggles, her respirator mask wheezing with every intake of air.
"The secondary floodgate is completely sealed," she called out, pointing her rod toward the heavy iron plate behind Daxian. "The administrative lock ran a baseline security flush. In ten minutes, the fluid level will hit the ceiling, and this entire pocket will be completely vented into the main disposal grid."
Daxian didn't waste words replying. He swam toward the wall beneath her ledge, his dead right arm dragging through the water like an anchor.
He reached up with his left hand, his fingers finding a loose weld on an old bypass pipe running vertically along the concrete blocks. He pulled his weight up, his muscles straining against the heavy, dull numbness of the gray slurry in his veins. His foundations felt entirely hollow, his internal system clicking with a sharp, persistent pain whenever he tried to gather his strength.
He had miscalculated the system's defenses. Now, he had to live with the structural consequences.
"The hound's core," Daxian wheezed, his chest pressing against the wet stone as he secured his hold on the pipe. "Is the signal device completely dead?"
Vesper pulled the brass machine from her pouch, shaking a stream of gray liquid from the manual toggles. The indicator light on the side was dark, the gold casing cracked along the primary logic seam.
"The feedback loop from the floodgate blast fried the receiver," she said, tossing the broken unit into the swirling water below. "We don't have a bridge to the local network anymore. Your messy purple script is the only thing left, and you saw what happened when you tried to use it on the main door."
"I tried to break the iron," Daxian said, his amber eyes narrowing as he looked up at the ceiling. "That was the mistake."
He looked at the vertical bypass line he was holding. It wasn't part of the active, high-pressure flush system; it was an old, manual relief line made of un-coded, cast iron. The administrators above hadn't updated this section of the grid in cycles. The pipe was covered in thick, flaky layers of oxidation, weeping small streams of rust-colored water from every joint.
The Scribble-Tech couldn't overwrite a live command stream from the main server. But a dead, mechanical valve didn't have a live stream. It just had physical weight.
"Vesper, the rod," Daxian said, extending his left hand toward her ledge. "Give me the hook."
She looked at his hand, then at the rising water, which was now barely two feet from the ceiling. The space inside the chamber was shrinking rapidly, the air becoming so hot and compressed it felt like a heavy weight pressing down on his eardrums.
"If you break that bypass, the internal pressure will drop the ceiling brackets," she warned, though she didn't hesitate to unhook her iron rod and slide it down into his grip. "We'll be crushed before we drown."
"We're already dead if we stay on this ledge," Daxian said.
He shoved the hooked tip of the iron rod directly into the main joint of the rusted bypass valve. He didn't try to summon a massive surge of energy. He couldn't risk the feedback shattering his remaining healthy tissue. Instead, he forced a tiny, sharp thread of his black ink directly into the rusted seam, using the Scribble-Tech to manually expand the microscopic cracks inside the iron.
He pulled down on the rod with everything his left arm had left.
Screeech.
The sound of the twisting iron was an agonizing, high-pitched scream that cut through the roar of the water. The rusted valve resisted for three seconds, the internal pressure of the pipe hammering against the iron rod until Daxian's fingers began to slick with his own dark, silver-flecked blood.
His muscles shook, his teeth grinding together until his jaw ached. He didn't think about his old throne, or his whited-out city, or his broken friend. He thought about the next inch of the lever.
Snap.
The main bolt sheared off cleanly, flying across the room and embedding itself into the opposite wall.
A massive, screaming jet of pressurized steam exploded from the fractured joint, striking Daxian directly in the chest. The force of the blast knocked him clean off the bypass line, sending him crashing backward into the deep, churning water below.
He went under again, the scalding steam having burned through the front of his white robes, leaving a raw, blistering sting across his ribs. He struggled to the surface, gasping for air in the tiny pocket of space remaining near the roof.
"The gate is moving!" Vesper yelled.
The sudden drop in internal pressure had broken the automated quarantine logic. The system above assumed the conduit had suffered a structural breach, and the primary safety protocols instantly kicked in to dump the fluid before the main lines could fracture.
With a heavy, mechanical groan, the massive rear floodgate began to slide upward, its iron edge lifting out of the water.
The current reversed instantly. The thousands of gallons of fluid trapped inside the chamber rushed backward through the opening, creating a powerful, violent undertow that swept Daxian and Vesper along with it.
Daxian didn't fight the pull. He let his body go limp, protecting his skull with his left arm as the rushing current dragged them back out of the narrow right archway and spit them out into the main intersection of the Deep Drain.
They slammed into the wide concrete floor of the primary channel, rolling through the shallow runoff until they hit the base of a large, dead air-separator.
Daxian lay in the mud, his chest heaving as he coughed up a mixture of water and gray slurry. His body was completely ruined, his tattered robes smoking from the steam burns, and his left hand shaking so violently he couldn't close his palm. He had survived his own miscalculation, but the cost was etched into every fresh scar on his flesh.
Vesper crawled out of the stream a few paces away, her iron rod still clutched in her hand, her respirator mask hanging loose around her neck. She looked at him through her cracked goggles, her face covered in dark grease and soot.
She didn't offer a word of praise. She didn't offer a hand.
"Joran's agents are definitely coming now," she said, her voice raspy and exhausted as she leaned against the dead separator. "The pressure drop just lit up the main control board in the middle tiers. They know exactly which sector failed."
Daxian managed to lift his head, his false amber eyes catching the faint, flickering light of the main tunnel. The small win had saved their lives, but their margin for error was completely gone.
"Let them come," Daxian whispered, his fingers digging into the grimy floorboards as he forced his broken frame to rise. "We know where the drains lead now."
Vesper stared at him for a long moment, a hard, calculating glint returning to her gray eyes. She didn't trust him, and he didn't trust her, but as the distant sound of the garrison's sirens began to echo through the upper pipes, they both knew they were stuck in the same script.
They turned toward the deep darkness of the primary channel, their boots splashing heavily as they waded further into the unmapped fringe.