Through the hole, the glare of kerosene pressure lamps from the surface illuminated the entire cavern. Men’s voices echoed down through the shaft—harsh, profane, and hurried.
“Hurry up with those dynamite crates!” a voice shouted from above. “Mr. Vale wants forty sticks lowered into the main arch by midnight! When this ceiling drops, the entire river will be choked! The water will back up into the south siphon and flood straight into our storage tanks on the east flat!”
Caleb crouched behind a boulder on the ledge, his rifle resting across the rock. “They’re going to blow the cavern dome. If forty sticks of dynamite explode in this chamber, millions of tons of limestone will collapse. The underground river will be diverted permanently into Vale’s private canals, and the springs below will die forever.”
Clara looked at the subterranean river. In the glare of the lantern light from above, the water churned violently, white and frothing as it battered the black basalt walls.
“My father warned him,” she said, her voice shaking with an ancient, sacred rage. “In the old times, the Apache medicine men said this river was the spinal cord of the desert. If you break the bone, the body withers. The grass will die. The mesquite will wither into thorns. In ten years, this valley will be nothing but white salt and blowing sand.”
“How do we stop them?” Caleb whispered. “There are at least six men on the plateau above the shaft. We can't climb up the drill hole, and the surface trail to the high mesa is exposed for half a mile. They’d cut us down before we cleared the brush.”
Clara didn't answer immediately. She was staring at the black basalt wall across the river chasm.
In the flickering light from the drill shaft, something carved into the dark stone caught her eye. It was not the English letters left by Nathaniel Morgan. It was an older, deeper glyph—a series of concentric circles surrounding a painted handprint made with red ochre that had survived centuries of dampness.
“There is an old way,” she whispered.
“What old way?”
“The Apache siphon,” Clara said, turning to him, her eyes wide with a strange, fierce brilliance. “Before the white settlers came, before the Spanish built their forts, my people used this cave during the dry seasons. When the river ran low, they opened the lower spillway by clearing the deadfall behind the red rock. If we open the lower gate, the air pressure in this chamber will change. The draft will suck the lantern flames and the smoke from above straight down into the shaft.”
Caleb stared at her. “You’re talking about creating a blowback. If the draft pulls downward, the sparks from their own steam boiler will be sucked down the pipe.”
“And it will ignite the dynamite crates sitting on the lip of the hole,” Clara finished.
“It will also bring down part of this ledge,” Caleb warned. “We’ll have twenty seconds to get out of this chamber before the ceiling drops.”
Clara looked at him, her dark eyes steady in the pale light. “My father died trying to protect this water, Caleb. Your father spent fifteen years living in silence to preserve it. Are you ready to finish what they started?”
Caleb felt a strange, profound calm wash over his spirit. The exhaustion, the pain in his burned hands, the fear that had pursued him since the train arrived in Red Hollow—all of it burned away, leaving behind only the cold, crystalline clarity of a man who had finally found the ground he was willing to die upon.
He reached out, his bandaged hand closing around hers. “Show me the gate.”
They crossed the roaring river on an ancient, slippery bridge of fallen limestone slabs that spanned the narrowest part of the chasm. The spray from the torrent soaked their clothes, turning the rock treacherous as wet glass, but Clara moved with the certainty of a mountain cat, guiding Caleb’s boots to every secure hold.
Behind the basalt pillar marked with the red handprint lay a narrow, natural chimney that cut downward into the living rock. It was choked with ancient cedar trunks, gravel, and river drift that had wedged into the fissure over centuries, creating an artificial dam that held back a deep, pressurized pool of water in a secondary reservoir.
“Here,” Clara breathed, wedging her iron hay fork into the center of the drift. “This is the keystone. If we dislodge this cedar log, the weight of the water behind it will blow the plug clean through into the lower gorge.”
Caleb slung his Winchester over his back, planted his boots against the basalt wall, and gripped the ancient, waterlogged timber with both hands. The wood was slick with moss, heavy as lead. He set his teeth, ignoring the agonizing burn as his blistered skin ground against the rough bark, and pulled with the concentrated fury of a man fighting for his ancestral earth.
The timber didn't budge.
High above, a metal cage began descending through the three-foot drill hole. Inside the iron mesh sat two wooden crates stenciled in bold red letters: HERCULES DYNAMITE – DANGER. A sputtering fuse was tied to the frame, intended to be lit before the cage reached the cavern floor.
“Caleb!” Clara cried, throwing her entire weight onto the iron lever. “Now!”
Caleb let out a guttural roar that echoed off the cavern walls. He channeled every ounce of strength from his back, his legs, his soul into that single log.
With a deafening CRACK, the ancient cedar trunk snapped in the middle.
The keystone gave way.
Instantly, the wall of water behind it struck the breach like a battering ram. Tons of pressurized water exploded through the fissure, sweeping away the gravel plug in a violent, roaring vortex. The sudden drainage created a massive low-pressure vacuum in the cavern chamber.
The air rushed outward with the force of a hurricane.