Chapter 11 - The Digital Footprint-11
"We can't leave it!" I shouted back, my voice echoing off the concrete walls of the electrical room. "The lithium battery banks are directly adjacent to the main structural supports of the eastern tower! If they go into thermal runaway, the structural integrity of the lower twenty floors could be compromised! There are hundreds of people in the lower lobby!"
"Arthur, you don't know how to disarm a military-grade thermite charge!" Vance argued, her flashlight beam shaking as she tracked the countdown timer.
00:32
00:31
00:30
"I don't need to disarm the bomb!" I yelled, the adrenaline wiping away any trace of pain or hesitation. I lunged forward, grabbing the heavy carbon-fiber briefcase containing the device. "The main water purification tanks we just passed—they hold fifty thousand gallons of industrial coolant water for the server systems! The emergency pressure relief hatch is right outside the door!"
Without waiting for her response, I turned and sprinted back into the narrow corridor, clutching the ticking briefcase to my chest with my good arm. My broken hand throbbed with an agonizing intensity, but I ignored it, focused entirely on the green glowing numbers reflecting off the plastic casing of the bomb.
00:18
00:17
00:16
I reached the massive, cylindrical steel structure of Water Tank Bravo. Tucked near its base was a heavy, circular maintenance wheel marked Emergency Drainage Matrix.
I threw the briefcase onto the ground, grabbed the steel wheel with my right hand, and threw my entire body weight against it. It didn't budge. The rust and pressure had locked it tight.
"Help me!" I screamed.
Agent Vance appeared beside me, slamming her service weapon into her holster and grabbing the opposite side of the wheel. Together, we let out a unified, desperate roar of exertion. The wheel groaned, sparks flying from the old metal, and finally spun open with a loud, mechanical screech.
A heavy, circular hatch slammed open, revealing a roaring, high-pressure vortex of freezing, chemical-treated water rushing down into the deep subterranean drainage tunnels that led directly to the Silver Valley river basin.
00:05
00:04
I grabbed the briefcase, kicked it squarely into the center of the roaring water vortex, and slammed the heavy steel hatch shut, spinning the wheel back into the locked position just as the timer hit zero.
A dull, muffled THUD vibrated through the steel walls of the tank, followed by a violent, localized hiss of steam that rattled the heavy pipes. The water inside churned frantically for a few seconds, absorbing the intense, multi-thousand-degree heat of the thermite explosion, before the system stabilized, carrying the neutralized threat down into the deep earth.
I collapsed against the side of the tank, sliding down to the damp floor, my breath coming in short, ragged wheezes.
"That... was entirely insane, Mr. Callahan," Agent Vance said, leaning against the adjacent pipe, her face covered in sweat and grease, a look of profound respect in her eyes.
"She’s gone, isn't she?" I asked, staring blankly into the darkness. "The briefcase was a distraction. She used the forty-five seconds to reach the deep subterranean access tunnels."
"She did," Vance nodded slowly, pulling out her radio as the building's emergency backup lights finally flickered on, painting the room in a dim, eerie red glow. "But she made one fatal mistake, Arthur."
"What’s that?"
"She left her digital footprint behind," Vance said, walking over to the tool chest where the briefcase had been sitting. She picked up a small, black electronic dongle that had been plugged into the main electrical diagnostic port of the building. "She used this to override the security shutters and cut the main breakers. It’s a high-frequency short-range transmitter. And it’s still linked to her personal master device."
Vance plugged the dongle into her tactical tablet, her eyes tracking a rapid series of diagnostic lines that began to map out the underground architecture of the city.
"Look here," she said, showing me the screen. A small, pulsing red dot was moving quickly through a highlighted blueprint of the old, abandoned 1920s trolley tunnels that ran directly beneath the Vanguard Plaza, heading straight toward the central transit hub two miles away.
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"The tactical teams won't get down there in time," I said, pushing myself up, my jaw tightening. "But I know where that tunnel exits. It dumps out into the old basement storage facility of the Silver Valley Grand Central Station. My grandfather was a rail engineer here fifty years ago. He took me down there when I was a kid."
I looked at Vance, my eyes burning with an unquenchable fire. "We can intercept her before she ever steps onto a train."
