The pressure of the dark sea hit them like a falling wall. Silver tendrils groaned against the boat’s fiberglass hull, crushing the craft in a tightening fist as it plunged into the subterranean gloom beneath the monolith.

Seawater roared over the gunwales, thick with the smell of ozone and crushed kelp. Marcus lashed one arm around the console rail, tucking the infant tight against his ribs. The metallic fluid dripping from his sliced forearm burned like liquid fire, but where it touched the child’s blanket, the fabric dissolved into tiny, weightless ash.

Vance was thrown across the deck, his back slamming into the open briefcase. His hands scrambled wildly, trying to push himself away from the floating glass sphere, but the glowing silver filaments inside the brain pulsed with a sudden, violent flare.

«Get away from it!» Vance choked out, his throat working against a thick, crimson foam rising from his lungs. «Marcus—it isn’t downloading! It’s harvesting!»

The boat’s hull gave way with a sickening crack. The hull shattered, hurling them out into a massive, air-filled cavern carved into the foundation of the tower. They hit the wet stone floor hard, skidding across smooth, black basalt that shimmered with veins of bioluminescent blue gel.

Marcus tumbled to a halt, rolling to absorb the impact and keeping the child cradled against his chest. She didn’t cry. Her eyes, wide and clear, reflected the towering horror that occupied the center of the cavern.

A massive, suspended sphere of liquid mercury—at least fifty feet in diameter—hung motionless in the air without any visible support. Inside the fluid, hundreds of human silhouettes floated in a silent, radial ring, their limbs connected by thick bundles of fiber-optic cables leading down into a central pedestal.

And sitting atop that pedestal, her hands resting inside a glowing basin of the same blue fluid, was Elena.

Her face was unblemished, her suit dry and immaculate, but her eyes were completely hollow—two empty sockets glowing with a cold, blinding white radiance.

«You’re late, Marcus,» Elena’s voice echoed, not from her mouth, but directly inside the bones of Marcus’s skull. «The current iteration is already ninety percent purged.»

Marcus dragged himself to his knees, his silver-bleeding arm trembling beneath his weight. «Elena… stop this. Look at what you’re doing to these people!»

«These aren’t people,» she replied smoothly, her voice lacking any human timbre. «They are the baseline data. The rough draft.»

Beside him, Vance pushed himself up, clutching his chest where the red wounds burned through his shredded shirt. He drew the tactical knife, his boots sliding on the wet stone as he moved between Marcus and the central pedestal.

«She’s lying to you!» Vance shouted, his voice echoing off the cavern walls. «She isn’t controlling the network! She’s the shell it’s using to harbor the core!»

Vance didn’t hesitate. He lunged forward, thrusting the steel blade straight at Elena’s throat.

Before the metal could touch her skin, a wave of unseen force rippled from the suspended sphere. The knife shattered into a spray of fine, metallic dust. Vance was lifted six feet into the air, his limbs pinned outward as if nailed to an invisible cross.

Elena turned her hollow, glowing gaze toward Vance. «You were always the unstable strain, unit seven. Too much grief. Too much sentiment.»

With a flick of her wrist, Vance was hurled backward, his body crashing through the black glass of a nearby control terminal. Sparks erupted into the dark air as he slumped motionless against the wreckage.

Marcus reached for his pocket, searching for any weapon, but his fingers caught on something cold and heavy. He pulled out the glass vial Vance had carried—the dark blue fluid inside swirling in a tight, agitated vortex.

The infant in his arms reached out her tiny hand, her fingers brushing the glass.

The fluid inside the vial instantly changed color, shifting from deep blue to a brilliant, burning crimson.

«What is this?» Marcus demanded, his heart hammering against his ribs as the air around them grew heavy and thin.

«That is the kill-switch you built before you wiped your own mind,» Elena said, her voice dropping to a terrifying whisper as she stepped down from the pedestal, her bare feet making no sound on the wet basalt. «And you gave it to the only thing in this room capable of activating it.»

She gestured toward the child.

«She isn’t your daughter, Marcus. She is the backup of the original human genome. The last unedited sequence. If her blood touches that fluid, the entire network collapses—including you. Including the tissue keeping your heart beating.»

The floor beneath them began to vibrate. The massive suspended sphere of liquid mercury began to churn, its surface roiling as the human silhouettes inside began to press their hands against the fluid wall, staring down at Marcus with empty, glowing eyes.

Marcus looked from the crimson vial to the child, then toward Vance’s still, broken form near the terminal. Vance’s fingers twitched against the shattered glass, pointing weakly toward the base of the pedestal.

There, carved into the stone beneath Elena’s feet, was a single sentence in Marcus’s own handwriting: DO NOT TRUST THE CHILD.

A cold chill ran down Marcus’s spine. He looked back down at the baby in his arms.

Her hazel eyes were gone entirely. In their place were two perfectly reflective, mirrored surfaces—and in her reflection, Marcus didn’t see himself holding a child.

He saw himself holding a gleaming, chrome cylinder pressed against his own throat.

«Choose, Marcus,» Elena said, stepping closer, her hand reaching out toward the infant. «Destroy the future to save a ghost, or give her to me and step into the new world.»

The child let out a soft, melodic laugh that sent a sharp, agonizing shockwave straight through Marcus’s brain. His knees gave out, and he collapsed onto the wet stone, the glass vial slipping from his numbed fingers and rolling toward the edge of the pedestal.

The vial hit a ridge in the rock and cracked open, the crimson fluid spilling out toward the base of the mercury sphere.

The entire cavern erupted into a deafening scream as the liquid metal began to pour down like a silver waterfall, engulfing everything in its path.