Sofía Márquez POV
The moment the Sweepers' boots hit the upper platform, the entire shaft turned into an echo chamber of metallic thunder.
We had seconds.
Maybe less.
The thermal cage around Julián hummed like a sleeping beast. Thick alloy walls, hexagonal pattern, cold to the touch.
I sprinted back across the platform as the first Sweeper rappelled into view—armor matte-black, face hidden behind a featureless visor, rifle already raised.
"Contact!" I shouted.
Miguel pushed Camila behind him and opened fire. The rounds sparked against the Sweeper's chestplate—useless.
Another hooked down the rail.
Then another.
Then four more.
"Fall back!" I yelled.
Elena dragged Julián deeper into the vault hallway. He was barely conscious, breathing in ragged bursts—each inhalation a visible shimmer in the air.
I slid beside Miguel and fired at the frame above the lead Sweeper. The bullet hit an exposed cable and a shower of sparks rained down, briefly blinding the unit.
"Good!" Miguel said, reloading. "Keep doing that!"
"I don't pick my miracles, I just use them!" I shouted back.
The Sweepers advanced with terrifying discipline, spreading out to form a kill box.
We needed cover.
We needed doors.
We needed—
"Elena!" I shouted. "Is the vault still powered?!"
She looked at the panel, hands shaking.
"Yes! Manual override—six digits!"
"THEN CLOSE IT!"
She typed. Fast.
The Sweepers opened fire—suppressed rounds slicing through the dust like silent needles. One grazed my shoulder. My vest caught it.
Another ricochet clipped Miguel's arm.
He hissed.
But stayed upright.
The vault door began sliding shut.
Sloooooowly.
Too slowly.
"Come on!" I roared.
The Sweepers surged.
I threw myself backward into the vault just as one reached through the narrowing gap—its gloved hand trying to wedge the door open.
I emptied my magazine into its wrist. The armor dented, but the fingers didn't release.
"Damn it—!"
Then—
Julián moved.
Still kneeling.
Still broken.
But alive.
He reached out and touched the vault door.
The metal froze—literally frosted over in an instant, as if he were pulling heat not from the reactor now… but from the steel itself.
The temperature drop shocked the Sweeper's hand; it spasmed and retracted.
The vault door slammed shut.
We were sealed in.
Alive.
For now.
Dr. Elena Vargas POV
The moment the door sealed, the lights inside the vault flickered, stabilizing into a pale blue glow. The space was bigger than expected—rows of consoles, old scientific equipment, emergency bunk beds, oxygen lines, ration lockers.
And on the center table:
A reactor model.
Old. Damaged. But unmistakable.
Rojas had been here for months.
"Everyone okay?" I asked.
Miguel nodded, holding his arm. Sofía was wiping blood from her shoulder.
Julián…
I knelt beside him.
"Hey," I whispered. "Stay with me."
His breathing was shallow, but calmer. The veins no longer glowed. His skin was cold—too cold. The thermal cage had stripped him of the reactor's influence but also destabilized his internal balance.
We had minutes to rewarm him safely, or he'd go into systemic shock.
I grabbed the emergency thermal blankets.
"Don't wrap me," he murmured, voice rough. "I'll scorch them."
"No," I said firmly. "Not right now. You're losing heat. Your cells are compensating in the wrong direction."
He almost smiled.
"Doc… I feel empty."
My chest tightened.
"You're not empty. You're alive."
Behind us, Sofía rummaged through Rojas's improvised workbench.
And found the remote.
The blinking red button was steady now—no longer blinking.
Steady.
Waiting.
Miguel stepped closer. "What the hell does it do?"
I swallowed.
"Rojas was the type of man who built kill-switches hidden inside emergency protocols. That button could trigger anything: lockouts, reactor scram, meltdown, gas seal, drone swarms—"
"Or a message," Sofía said.
I looked at her.
"What?"
She held the remote up to the vault ceiling.
A tiny red sensor—almost invisible—blinked back.
"He wasn't just controlling the facility," she said. "He was communicating with it."
The idea chilled me.
"We need to figure out what he activated before he died."
"And we need to know what's above us," Miguel added, listening to faint thumps from the shaft. "The Sweepers aren't leaving."
Julián tried to sit up. I held him down.
"Don't—"
"I hear something," he said.
"What?" Sofía asked.
His eyes unfocused, as if tuning into a frequency only he could sense.
"The reactor," he whispered. "It's… changing."
"Changing how?" I pressed.
He swallowed.
"It's preparing."
"For what?"
He looked up at me with a fear I had never seen in him.
"For a purge."
Sofía Márquez POV
A purge.
I didn't like the sound of that.
"Define purge," I said.
Julián clenched his jaw. "Temperature spike. Controlled. Maybe. If it's controlled."
"And if it's not controlled?" Miguel asked.
His silence was the answer.
Elena moved to the nearest console. "The remote must tie into the purge protocol. It's probably the pre-trigger."
"Meaning?" I pushed.
"It's waiting for confirmation."
She met my eyes.
"Someone needs to press the button… or stop it."
I looked at the remote.
A single red button.
No labels.
No second chances.
"Okay," I said, breathing hard. "We find the reactor interface. We stop the purge. Or reroute it."
"We also need to escape before the Sweepers breach this door," Miguel added, checking his ammo. "Which is about—"
Metal groaned behind us.
"—now."
Camila whimpered.
"Focus," I said. "We have two objectives:
Keep Julián alive.
Stop the purge."
Elena nodded.
Miguel readied his weapon.
Julián slowly stood, legs trembling but holding.
"I can help," he said.
"El reactor es veneno para ti—" Elena started.
"I know," he cut her off. "But I'm the only one who can feel what it's doing. The only one who can sense the changes before they happen."
He looked at the far hallway—the one leading deeper underground.
"Through there," he said. "The control sub-core."
"Perfect," I said. "We move."
Then—
A loud metallic THUD shook the vault door.
Dust rained from the ceiling.
Another.
And another.
The Sweepers were switching tactics.
Breaching charges.
We didn't have minutes.
We had seconds.
"Sofía!" Elena shouted, holding the remote. "What do we do about this?!"
I grabbed the remote from her, shoved it into my vest pocket.
"We take it with us," I said. "If this thing can confirm or cancel the purge, we don't leave it behind."
The vault lights dimmed.
A siren began to hum from the depths of the reactor chamber.
Low.
Rising.
Rhythmic.
Julián's eyes widened.
"That's it," he whispered. "That's the purge sequence starting."
"MOVE!" I shouted.
We ran into the tunnels as the vault door exploded behind us.