Chapter 77 - Pressure Threshold
Seven miles above, the concrete floor of the garage began to vibrate.
Miller paused, looking down at his boots. "What is that? Did you turn on the secondary compressor?"
Arthur, tied to the post, began to laugh—a loud, booming laugh that echoed off the corrugated metal walls. "You idiots! That’s not a compressor! That’s Cassidy!"
Before Donald could speak, the heavy steel cap covering the vertical bore began to glow a dull, dangerous cherry-red. The warning sirens mounted on the garage walls shrieked in unison. A column of superheated steam, whistling at a deafening pitch that shattered the garage windows into a million shards of glass, erupted through the secondary safety relief pipes.
The blast wave threw Miller and his contractors off their feet, sending the digital detonator skidding across the concrete floor.
Donald screamed as a blast of scalding vapor tore through the open doorway, singing his hair and scorching his jacket. "Shut it down! Shut it down!" he shrieked, scrambling on his hands and knees through the blinding white steam.
Eleanor dropped her purse and fled into the yard, wailing in terror as the ground beneath the manicured lawn began to heave and crack like an earthquake.
Seven miles down, in Trench Eleven, Cassidy watched the monitor as the surface seismic sensors registered the disruption. The detonation signal had been scrubbed by the pressure surge.
"We have a window," Cassidy said, turning to her father. "The steam purge bought us fifteen minutes before the automated safety valves close the bypass. The emergency auxiliary hoist is powered by the pressure venting cycle. We can ride the counter-weight capsule to the surface right now."
Richard leaned heavily against his daughter, his body racked with coughing. "Cassie... I don't know if I can make the ascent. The atmospheric pressure change... my lungs are too damaged."
"You survived thirty years down here, Dad," Cassidy said, wrapping her arm securely around his waist and hoisting him toward the airlock. "You are not dying in this hole. You’re going to walk into the sunlight, and you’re going to watch them take Donald away in chains."
Together, they staggered into the auxiliary hoist capsule—a compact, high-speed survival pod designed for rapid geological evacuation. Cassidy slammed the internal hatch shut, dogging the steel wheel with every ounce of strength in her arms.
She engaged the cylinder key into the capsule’s ignition matrix.
`EMERGENCY ASCENT SEQUENCE: ENGAGED.`
`BALLAST PURGE IN THREE... TWO... ONE.`
The capsule launched upward like a bullet from a rifle. The acceleration pushed Cassidy and Richard back into the padded acceleration couches with crushing force. The rock walls outside the viewport were a vertical smear of black and gray. 30,000 feet. 20,000 feet. 10,000 feet.
The cabin pressure regulator hissed violently, fighting to equalize the nitrogen balance in Richard's blood. Cassidy held her father's hand tightly, watching his vital signs flicker on the pod’s monitor. "Stay with me, Dad! Breathe! Look at me, keep your eyes on me!"
"I'm... I'm looking, Cassie," the old man wheezed, his fingers gripping hers with surprising strength. "I'm looking at you."
At 1,000 feet, the capsule hit the emergency deceleration buffers. Heavy hydraulic friction plates clamped onto the guide cables, throwing up a rooster-tail of sparks that illuminated the dark shaft before bringing the capsule to a shuddering, steam-shrouded halt at the Sub-Level 1 landing platform.
Cassidy hit the explosive hatch bolts.
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The hatch blew open with a cloud of expanding vapor. Cassidy stepped out into the ruined, steam-filled garage of Ridge Road, her father supported against her shoulder, just as the flashing red and blue lights of state police cruisers swept across the shattered driveway.
***
