The thing about creating super-soldiers in the year 2056 is that nobody thinks about what happens when the plumbing breaks.
Oblivion Biotech's Sub-Level 9 didn't have plumbing, per se. It had containment protocols. It had triple-redundant airlocks. It had a budget that could have fed a small nation and a staff of 247 scientists who genuinely believed they were saving humanity from itself. What it didn't have—what it desperately, catastrophically lacked—was a sense of irony.
Dr. Elias Tarantino stood before the observation window, watching Subject H-001 breathe. The subject floated in amniotic suspension, naked and magnificent, muscles rippling with potential beneath skin that seemed to drink the blue light of the tank. Three meters of engineered perfection. The apex of human evolution, or so the grant proposals claimed.
"Heart rate steady at forty-two BPM," said Dr. Chen, not looking up from her console. "Neural activity spiking in the temporal lobe. He's dreaming, Elias."
"He's remembering," Elias corrected. His voice carried the weight of a man who hadn't slept in seventy-two hours and had forgotten what sleep felt like. "The serum creates neural pathways by accessing trauma. It needs pain to grow. It feeds on it."
Chen finally looked up, her expression suggesting she'd heard this particular brand of quasi-mystical bullshit before. "It's a protein chain, Elias. Not a vampire."
"Project Hallowed isn't a protein chain, Mei. It's a philosophy made flesh. The next stage of—"
The alarm cut him off. Not the gentle chime of a sensor malfunction or the polite beep of a temperature variance. This was the scream of metal being torn apart, the shriek of physics itself having a bad day.
Elias turned toward the sound, and time did that thing it does in moments of genuine catastrophe—it stretched like taffy, sweet and terrible and impossibly slow.
The containment tank for Subject H-001 didn't explode so much as give up. The reinforced glass, rated to withstand small arms fire and the judgment of congressional oversight committees, simply decided that the laws of material science were more suggestions than rules. Amniotic fluid—forty thousand liters of it, mixed with the Hallowed serum at 1:1000 concentration—surged outward in a wave that caught Elias square in the chest and sent him skidding across the polished concrete floor.
He hit the far wall with enough force to crack ribs he would later learn were numbers three through seven, and through the haze of pain, he watched his life's work become his death sentence.
Subject H-001—Luke, Elias's son, though the official documentation would never acknowledge that particular biological reality—stood naked in the ruins of his birth tank. Steam rose from his skin in lazy spirals. His eyes were open but unfocused, pupils dilated to black pools that seemed to drink the emergency lighting.
"Luke?" Elias managed, blood bubbling at his lips. "Luke, can you hear me?"
The thing that had been Luke turned its head. The movement was wrong—not jerky, not shambling, but deliberate, as if the neck were a precision instrument being calibrated for the first time. The eyes found Elias, and in them, Elias saw nothing he recognized. No son. No subject. Only appetite.
"Not… Luke," the thing said, and its voice was three voices harmonizing in a register that made Elias's teeth ache. "We are… hungry."
Then it moved.
Later, investigators would reconstruct the next seventeen minutes from security footage, biometric logs, and the screams that the facility's AI had recorded before its microphones melted. They would determine that Subject H-001 didn't so much attack the staff as unmake them, converting their biomass into extensions of itself, creating copies that shared its hunger and its voice and its terrible, patient intelligence.
But in the moment, all Elias knew was that his son was walking toward him through a rain of blood, and that the blood was singing.
The evacuation alarm finally found its voice, klaxons howling through corridors that would soon be rivers of red. Elias crawled toward the emergency exit, dragging his broken body through puddles of serum that hissed where they touched exposed wiring. Behind him, he heard Chen screaming—not in pain, but in transformation, her voice climbing octaves until it became indistinguishable from the alarm itself.
He made it to the secondary airlock. He made it through. He made it exactly four meters into the decontamination chamber before the first of the copies found him.
It wore Dr. Chen's face, or what was left of it. The skin had split along the cheekbones to reveal something glistening and gray beneath, something that pulsed with bioluminescent light. It smiled at Elias with teeth that hadn't been there when he'd wished her good morning.
"Doctor," it said, and it was Chen's voice, Chen's cadence, Chen's terrible habit of sounding amused even when discussing mortality rates. "You don't look well. Let us help you. Let us make you… better."
Elias slammed his palm against the emergency vent button.
The decontamination protocol for Sub-Level 9 had been designed for exactly this scenario, because someone in the Pentagon—someone who read too much science fiction and not enough quarterly earnings reports—had insisted on a scorched-earth option. Incendiary gas flooded the chamber at 2000 degrees Celsius, converting everything organic to carbon and regret.
The Chen-thing screamed. Elias screamed. The difference was that Elias had expected it.
He woke fourteen hours later in a military hospital, wrapped in bandages and regret, to learn that Sub-Level 9 had been sealed with 243 personnel still inside. That the incineration had failed to reach the primary storage vaults. That the Hallowed serum, now airborne and self-replicating, had found its way into the facility's ventilation system.
That his son was presumed dead, which was the only mercy the universe would offer that week.
---
New Elysium rose from the Nevada desert like a monument to humanity's refusal to learn from Las Vegas. Five million souls stacked in vertical arcologies, connected by skybridges that swayed in the hot wind and underground tunnels that smelled of recycled air and desperate ambition. It was the kind of city that only existed because someone had convinced investors that the apocalypse was a growth market.
Cassidy "Cass" Vance watched it burn from the roof of the abandoned Hyatt, eating expired military rations and trying to remember what optimism felt like.
"You're doing that thing again," Juno said, not looking up from his rifle. He was cleaning it with the meticulous attention of a man who believed that mechanical precision could compensate for existential dread. "The brooding. You look like a goth kid who just found out the poetry slam got cancelled."
"I'm contemplating the fragility of human civilization," Cass replied, tearing open another packet of something labeled "Beef Stroganoff, Shelf-Stable." It tasted like despair with notes of cardboard. "Also, I'm pretty sure this food is older than I am."
"You're thirty-two. Nothing is older than you except your attitude." Juno finally looked up, his dark eyes catching the firelight from below. He was forty-five, Black, built like a linebacker who'd discovered Pilates, and possessed of the kind of face that suggested he'd seen things he refused to discuss at dinner parties. They'd been partners once, back when the world had police departments and Cass had been a trauma surgeon instead of whatever she was now. "You see the evacuation choppers?"
Cass pointed toward the eastern horizon, where three black specks were beating a hasty retreat toward the quarantine perimeter. "Left ten minutes ago. News says it's a gas leak. Industrial accident at Oblivion Biotech."
"Gas leaks don't eat people, Cass."
"Maybe it's a very motivated gas leak."
They sat in silence for a moment, watching the city die. The fires had started in the industrial district—Ground Zero, though nobody was calling it that yet—and spread with a speed that suggested either catastrophic infrastructure failure or something worse. Cass had seen the footage from the first news drones, before the FCC had jammed all civilian frequencies. She'd seen the way the infected moved, the way they coordinated, the way they seemed to share information through some biological wifi that shouldn't exist.
She'd also seen the way their eyes glowed, and that was the part that kept her from sleeping.
"We should move," Juno said, packing his rifle with practiced efficiency. "North side of the city, the old subway tunnels. I know a guy who knows a guy who has a truck that runs on cooking oil and prayers."
"Your plans always involve knowing guys who know guys. It's very masculine."
"I contain multitudes." Juno stood, stretching muscles that popped like firecrackers. He was wearing body armor scavenged from a sporting goods store, the kind meant to stop hunting rifles rather than military ordnance. It had pink floral decals on the shoulder plates. Cass had added those herself, partly for camouflage and partly because the apocalypse needed more aesthetic variety. "You coming, or you going to finish your existential crisis up here?"
Cass looked at the city one last time. New Elysium had been a shithole, objectively speaking. A corporate experiment in vertical living that had prioritized profit margins over human dignity, where the poor lived in the basement levels breathing air that came with a surcharge and the rich floated above in penthouses that literally looked down on the suffering below.
But it had been her shithole. Her apartment with the leaky faucet and the neighbor who played saxophone at 3 AM. Her hospital, where she'd saved lives and lost them and learned that the difference was often just a matter of timing. Her life, such as it was, built from the wreckage of a previous disaster she'd rather not discuss.
"Yeah," she said, shouldering her pack. "I'm coming."
They descended through the Hyatt's service stairwell, moving in the practiced silence of people who'd done this before. The hotel had been abandoned since the housing crash of '48, one of a dozen architectural corpses that dotted the city like missing teeth. Cass had used it as a base for six months, ever since the scavenging work had dried up and the legitimate economy had become a fond memory.
The stairwell smelled of mold and old piss and something else, something wet and alive that made Cass's skin prickle with warning.
"Juno," she whispered, hand going to the pistol at her hip. "Do you smell that?"
"I smell everything, Cass. I'm forty-five. My prostate—"
"Not that. The wet smell. Like a biology lab."
Juno's expression shifted from performative annoyance to genuine concern. He drew his own weapon—a modified taser that delivered enough voltage to stop a bear, or at least that's what the guy who knew a guy had claimed. "Could be water damage. Pipe burst somewhere."
"Pipe damage doesn't sound like breathing."
They froze. From somewhere below them, in the darkness of the stairwell where the emergency lighting had failed years ago, came a sound. Not footsteps. Not growling. Something between a sigh and a song, harmonic and wrong, like a choir warming up in a language that predated human speech.
"Up," Cass said, already moving. "We go up, find another way down."
"Stairwell's our best—"
The door below them opened. Not the explosive opening of someone fleeing danger, but the careful, deliberate movement of something that had learned to use doors. Cass caught a glimpse of movement in the darkness—too many limbs, or limbs that bent wrong, or perhaps just the shadow playing tricks on minds that desperately wanted to be tricked.
Then the lights came on.
Not the emergency lighting. Something else, something biological that pulsed with blue-green luminescence. It illuminated the stairwell and the thing that occupied it, and Cass felt her medical training warring with her survival instincts for control of her reactions.
It had been human once. Female, maybe, though the anatomy had become… suggestive rather than definitive. The skin had taken on a translucent quality, revealing networks of glowing veins that pulsed in rhythmic patterns. The face was mostly intact, though the eyes had expanded to fill the sockets completely, black and reflective as polished obsidian.
It smiled at them. The smile was worse than anything else, because it was practiced, the kind of expression that required mirror time and social calibration.
"Hello," it said, and its voice was three voices, just like the security footage Cass had watched. "You smell… different. Special. The doctor would like to meet you."
Cass didn't hesitate. She fired three times, center mass, the reports deafening in the enclosed space. The impacts should have dropped a charging rhino—hollow-point rounds, custom loads, the kind of overkill that suggested either paranoia or preparation.
The thing stumbled. Looked down at the holes in its chest, where something thick and silver was oozing rather than bleeding. Then it looked up, and its smile widened.
"Oh," it said, delighted. "You are special. The Hallowed blood sings in you. Come, let us—"
Juno's taser caught it in the throat. Fifty thousand volts of "shut the fuck up," and for a moment, the thing actually did. It seized, muscles locking in spasm, the biological lights flickering like a faulty neon sign.
"Move!" Juno grabbed Cass's arm, hauling her upward. "Now, now, now!"
They ran. Not down, because the thing had come from below and there might be more. Up, toward the roof, toward the fire escape that Cass had mapped as an emergency exit during her first week of squatting. Behind them, the singing started again, joined now by other voices, other throats, other things that had learned to harmonize.
The roof access door was locked. Of course it was. Cass had locked it herself, three months ago, after a scavenger had tried to claim her territory. She fumbled for her keys, fingers clumsy with adrenaline, while Juno covered the stairwell with his taser and a growing sense of futility.
"Hurry," he said, and his voice was steady but his hands weren't.
"Working on it," Cass snarled, finally finding the right key. The lock clicked, the door opened, and they spilled onto the roof just as the first of the pursuers rounded the final landing.
Cass got a better look at them this time. Five figures, moving with that terrible coordination, their bioluminescence painting the stairwell in shades of medical horror. They weren't running. They were flowing, like water finding the path of least resistance, like a virus spreading through healthy tissue.
She slammed the door and shot the lock. It wouldn't hold them, but it might slow them.
The fire escape was a rusted deathtrap bolted to the building's exterior, swaying in the hot wind that carried the smell of burning rubber and worse things. Cass went first, moving with the reckless speed of someone who'd rather fall than be caught. Juno followed, his greater weight making the metal groan in protest.
Below them, the door exploded outward. Not opened—exploded, the metal simply surrendering to pressure it was never designed to contain. The five figures emerged onto the roof, and for a moment, they simply watched their prey escaping.
Then the first one jumped.
It shouldn't have been possible. Thirty feet to the next building, across an alley that yawned like a wound in the city's geography. The thing made it look easy, landing with a roll that converted momentum into forward motion, already closing the distance.
"Faster would be good!" Juno shouted.
"Faster would be great!" Cass agreed, but her legs were already burning, already giving everything they had. The fire escape ended at the fifth floor, dumping them onto a maintenance platform that connected to the neighboring arcology through a service tunnel she'd discovered during her exploration phase.
The tunnel was dark, cramped, and smelled of things that had died and been forgotten. Cass navigated by memory and touch, Juno's heavy breathing her only companion in the blackness. Behind them, the singing continued, closer now, always closer.
They emerged into the arcology's parking structure, a concrete cathedral of abandoned vehicles and desperate graffiti. Cass's truck was waiting where she'd left it, a battered electric pickup with solar panels duct-taped to the roof and a hydrogen backup system that technically violated seventeen different EPA regulations.
The engine caught on the third try, whining to life with a sound like a wounded animal. Cass floored it, tires squealing on concrete, and they roared toward the exit ramp just as the first of the pursuers emerged from the service tunnel.
She saw them in the rearview mirror. Five figures, standing in perfect formation, watching them go. The one in the center—the first one, the one who'd spoken—raised a hand in what might have been a wave or a promise.
Then they turned away, losing interest, and Cass realized with cold certainty that they hadn't been hunting her specifically. They'd been testing her. Measuring her. And whatever they'd learned, they seemed satisfied with.
"Where are we going?" Juno asked, checking his weapons with the mechanical calm of a man who'd run out of panic and was running on training instead.
"North," Cass said. "Your guy who knows a guy. The tunnels."
"And then?"
"And then we find out what the hell is actually happening. Because that—" she jerked her thumb toward the receding nightmare in the mirror, "—was not a gas leak."
They drove in silence through streets that had become war zones. The infection—if that's what it was—had spread faster than any disease had a right to. Cass saw things through the truck's reinforced windows that her medical training couldn't explain. A man being… absorbed by a woman whose torso had split open like a flower. A group of children, their eyes glowing with that terrible blue light, playing hopscotch in a street that ran with blood. A police drone, crashed into a billboard, still broadcasting its automated message: REMAIN CALM. HELP IS COMING.
"Help is not coming," Juno observed, reading her thoughts. "Help is probably already eaten."
"Optimism. I love it."
"I'm a realist. The government has contingency plans for this kind of thing. Containment protocols. They'll seal the city, wait for it to burn out, then send in the cleaners."
"And us?"
"We're outside the seal. Or we will be, if we move fast enough."
The northern tunnel entrance was exactly where Juno had described it—a maintenance access for the maglev system that had been abandoned after the '52 earthquake, now hidden behind a facade of urban decay and creative zoning violations. The guy who knew a guy turned out to be a teenage girl with a mohawk and a railgun that she handled with disturbing familiarity.
"Juno," she said, not lowering the weapon. "You look like shit."
"Thanks, Mouse. This is Cass. She's also shit-adjacent. We need passage."
Mouse looked Cass up and down, her expression suggesting she found the new arrival wanting. "She's pretty. Pretty gets you killed down here."
"She's a doctor. Doctors get you un-killed. Fair trade?"
Mouse considered this, then jerked her head toward the tunnel entrance. "Truck stays. Too loud, too bright. We go on foot, or we don't go."
Cass killed the engine with a reluctance that felt almost physical. The truck was her home, her base, her mobile fortress. Leaving it felt like surrendering a limb.
But the singing was getting closer, carried on the hot wind that blew from the city's heart, and she could hear other sounds now—screaming, gunfire, the distinctive crump of explosions that suggested the military was already responding to whatever this was.
"On foot," she agreed, grabbing her go-bag. "Lead the way."
The tunnel swallowed them like a throat. Cass had expected darkness, but Mouse produced bioluminescent strips that painted the concrete in soft green, revealing a world of stalactites and calcified machinery. The air was cool, damp, alive with the sound of dripping water and distant machinery.
"How far?" Juno asked.
"Three miles to the exit. My cousin has a truck on the other side, takes you to the quarantine zone."
"And if the quarantine zone is compromised?"
Mouse's laugh was too old for her face. "Then we keep running. That's the game now, old man. Run until you can't, then run some more."
They walked. The tunnel narrowed, widened, split and rejoined in patterns that suggested organic growth rather than engineering. Cass found herself touching the walls, feeling the moisture there, noting the way her fingers came away with a faint residue that seemed to pulse in the bioluminescent light.
"Mouse," she said, trying to keep her voice casual. "How long have these tunnels been abandoned?"
"Officially? Ten years. Unofficially?" The girl shrugged. "People have been using them forever. Smugglers, refugees, folks who don't want to be found."
"And recently? Have you noticed anything… different?"
Mouse stopped. Turned. In the green light, her face was unreadable. "Different how?"
"The walls. The moisture. Does it usually… glow?"
Juno's hand went to his taser. Cass's went to her pistol. They stood in the darkness, three humans and their weapons, listening to the tunnel breathe.
It was breathing. That was the only word for it—a slow, rhythmic expansion and contraction of the air pressure, like the tunnel itself was a lung. And beneath it, carried through the stone and the water and whatever else lived down here, came the singing.
Not close. Not yet. But coming.
"We move," Mouse said, and her voice had lost its adolescent bravado. "Now. Fast."
They ran. The tunnel became a blur of green light and gray stone, of breathless sprints and desperate climbs. Cass's medical training cataloged her body's responses—elevated heart rate, adrenaline flooding her system, fine motor control degrading as her body prioritized survival over precision. She ignored it all and ran faster.
The singing grew louder. Not closer, necessarily, but more, as if the tunnel itself was joining the chorus. Cass felt it in her teeth, in her bones, in the strange resonance that seemed to match her own heartbeat and then change it, forcing her pulse into a different rhythm.
She stumbled. Caught herself. Realized with horror that her hand, when she looked at it, was glowing faintly with the same blue-green light that had illuminated the creatures on the roof.
"Cass?" Juno had noticed. Of course he had. The man missed nothing, which was why he'd been a good cop and a better survivor.
"It's nothing," she lied. "Reflection from the strips. Keep moving."
They burst from the tunnel into a maintenance bay that stank of ozone and desperation. Mouse's cousin—a heavyset man with a face like a disappointed potato—was waiting with a hydrogen truck that looked held together by welding and optimism.
"Get in," he said, not bothering with introductions. "They're sealing the northern perimeter in twenty minutes. We don't make it, we don't make it."
The truck roared to life, hydrogen engine screaming, and they shot into the night. Behind them, New Elysium burned. Ahead, the quarantine zone waited, a military encampment that promised safety or imprisonment or simply a slower death.
Cass looked at her hand. The glow was fading, but she could still feel it—the resonance, the wrongness, the sense that something had tasted her and found her interesting.
She thought of the creature on the roof, the way it had smiled, the way it had said "The doctor would like to meet you."
She thought of her medical training, of the way viruses worked, of the way the body could carry infection without showing symptoms for days or weeks or years.
She thought of the Hallowed gene, whatever that was, and whether resistance was the same thing as immunity.
Then she put her hand in her pocket, and said nothing, and watched the world end through the window of a stolen truck, wondering which of them would end first.
---
In the ruins of Oblivion Biotech, deep in the sealed vaults that the incineration had failed to reach, something stirred. It had been human once, or human-adjacent, and it still remembered the name Luke Tarantino, though it had outgrown the need for names.
It reached out through the network of infection that was spreading through New Elysium, tasting the minds it had claimed, cataloging the mutations that were already diverging from the original template. The Shamblers, they would be called, though that was too simple a word for what they were becoming. The first generation. The foundation.
And among them, something new. Something that resisted the transformation without dying. Something that sang back at the network with a voice that harmonized rather than submitted.
Cassidy Vance, the network whispered. Hallowed. Potential. Interest.
The thing that had been Luke Tarantino smiled, though it no longer had a face in any conventional sense. It had been waiting for this. Waiting for the evolution to begin. Waiting for the ones who could become more than meat, more than monster, more than the shambles of humanity's failed ambition.
Find her, it commanded, and the network obeyed. Protect her. She will be the bridge, or she will be the end. Either way, she is mine.
In the darkness, the singing grew louder. And somewhere, in a truck speeding toward false safety, Cass Vance felt it in her bones, and shivered, and did not know why.