GRENUN: When The Air Killed Us

Chapter 12: The Exodus

The sound Jonas makes as he yanks the rubber mask off his face isn't a scream. It’s a wet, desperate gasp—the sound of a man plunging his head under ice water to extinguish a fire in his brain.

The dense, pale green vapor sweeps over his nose and chin instantly, wrapping around his throat like a collar of cold silk.

SKRRR-HHHH. SKRRR-HHHH.

My Dräger respirator buzzes violently as I drag in a panicked breath, the twin charcoal canisters on my jaw vibrating against my chin strap. Sweat stings my eyes, pooling inside the silicon facepiece until the world outside looks like a warped, yellow-green nightmare. My left hand is locked around the yellow emergency box so hard the hard plastic ridges bite deep into my palm.

"Jonas, no!" Mara shouts, her voice muffled behind her own dual-filter mask.

She reaches out with her left arm, her fingers hooking into the heavy leather fabric of Jonas's shoulder, trying to drag his massive frame backward into the room. But Jonas doesn't budge. He stands leaning over the overturned oak desk, his chest heaving, his mouth open wide, inhaling the thick aerosol straight out of the coastal night air.

I count the seconds inside my head. The red numbers from the lab manuals flicker across the dark inside of my eyelids: 60 SECONDS TO SYSTEMIC FAILURE.

One. Two.

The color leaves Jonas’s face not in a fade, but like ink bleeding into blotter paper. His ruddy, wind-burned cheeks turn a dull, chalky slate-grey.

Three. Four.

The heavy, dark veins across his neck don't swell slowly—they snap taut beneath his skin. They blacken, pulsing with a hard, rhythmic thrum that pushes outward like thick cables buried beneath his flesh. The black lines crawl rapidly upward, webbed and jagged, branching across his jawline, climbing his cheekbones, and spreading into his temples.

Five.

He turns his head slowly back toward the room. His brown eyes, which three minutes ago were burning with grief and fury, are gone. In their place are two milky, opaque spheres that reflect the blue light of the yellow box like polished marble.

He doesn't look at Mara. He doesn't look at me. He looks straight through us, as if we are made of dirty glass.

"She’s right," Jonas hums softly.

His voice isn't the rough, gravelly bark that threatened to crack my skull with a tire iron. It’s smooth, clear, and perfectly pitched—a rich baritone that vibrates through the rubber of my facepiece.

"The basement isn't cold at all, Mara," Jonas says, his slate-grey lips parting as another curling plume of pale vapor rolls out from between his teeth. "The water is warm. We don't need the coal stove anymore."

Mara freezes. Her hand slips off his leather shoulder as if she’s touched a high-voltage wire. Her hazel eyes widen behind her clear viewports, horror stripping every drop of color from her forehead.

"He's gone," I yell at her, my voice barking through my intake valve—phut-clack. "Mara! He’s infected! He’s breathing fog!"

The metal shutter behind Jonas gives off a terrifying, continuous screech.

The heavy iron rivets along the vertical masonry tracks pop in rapid succession—SNAP-SNAP-SNAP—like small firecrackers going off down the alley wall. The entire middle section of the metal gate buckles inward, collapsing over the oak desk in a twisted mess of rusted steel and shattered glass.

Behind Jonas, three more figures step over the collapsed shutter.

Frau Lindemann is in the lead, her floral apron dragging in the oily, knee-deep floodwater pouring into the store floor. Behind her stand two men in torn raincoats, their grey faces identical, their milky eyes wide and unblinking in the blue light of the scrubber core.

All four of them open their mouths at the exact same moment.

Schlaf, Kindlein, schlaf...

Der Vater hütet die Schaf...

The four-part harmony hits the enclosed air of the pharmacy like a physical shockwave. It isn't loud, but the acoustic resonance strikes the exact frequency of the building’s structural steel. The glass display cases that survived the quake begin to hum. The water at my knees shudders, forming perfect, geometric concentric rings across its dark surface.

A massive throb spikes behind my temples. My vision doubles.

For a terrifying, fraction of a second, I smell fresh pine needles. I hear the sound of my sister’s laugh from three summers ago in Rostock. The lullaby isn't coming through my ears—it’s bypassing my eardrums, vibrating straight through the bones of my skull into my memory center.

They're expanding the network, my lab-trained brain screams through the static of the hum. Four infected breathing in sync... the aerosol density is doubling every three seconds!

"Silas!" Mara screams, grabbing the strap of my coat with a desperate, wild grip. "The back exit! NOW!"

She raises the 12-gauge shotgun, aiming directly at the chest of the nearest transformed man, and pulls the trigger.

BOOM.

The flash of orange fire blinds my right eye for a second. The heavy blast hits the man full in the chest, knocking him backward against the iron shutter frame. But he doesn't fall. He doesn't bleed red. He simply absorbs the kinetic force, staggers back half a step, and continues to hum, his grey flesh barely torn where the lead shot struck.

"It doesn't stop them!" Mara yells, racking another heavy shell into the chamber—CLICK-CLACK. "Retreat!"

I don't look back again. I shove the yellow emergency box under my left armpit, clamping it against my ribs, and sprint toward the rear prescription counter.

My leather work shoes slam into the knee-deep black water that has flooded the lower back aisle. The water is freezing, full of floating paper prescription receipts, plastic pill bottles, and slick chemical sludge. Every step drags like I'm running through wet cement, my thighs burning as I fight the drag of the flood.

Behind us, the blue light from the yellow box under my arm pulses faster, its internal cooling fan screaming at maximum RPM as it tries to scrub the massive cloud of green gas rolling through the broken window.

WARNING: AIRBORNE CONCENTRATION EXCEEDS SCRUBBER CAPACITY

EFFECTIVE RADIUS COMPROMISED: 8 METERS

The red LED numbers on the box’s digital monitor flash frantically through the fog. The fifteen-meter safe zone is shrinking. The fog is winning.

Mara vaults over the wooden counter, her tactical boots landing with a heavy SPLASH in the flooded hallway leading to the delivery alley. She grabs the rusted iron wheel of the emergency fire door, throwing her weight against it until the locking dogs disengage with a loud, hydraulic screech.

"Get out!" she snaps, shoving the heavy steel door open three inches.

A wave of fresh, ice-cold Baltic wind rushes into the narrow hallway, carrying black sea spray and heavy raindrops that splatter across our visors.

I throw myself through the gap, my shoulder slamming into the wet brick wall of the rear alleyway. Mara plunges out right behind me, throwing her full weight backward against the door and spinning the exterior iron wheel until the deadbolts drive home into the frame.

CLANG.

The heavy steel door seals shut, cutting off the sound of the lullaby.

We stand in the narrow, pitch-black alley behind Hauptstrasse, sinking up to our shins in black, rushing floodwater.

The rain above us is relentless—a dark, freezing deluge falling from a sky that has no sun, no clouds, and no stars. Just a flat, suffocating dome of dark grey ash suspended over the drowned ruins of Greifswald. The sea has swallowed the lower streets entirely; the alleyway is a rushing river of dark sea water carrying floating timbers, oil drums, and dead power lines.

Mara slumps against the wet brick wall, her chest heaving violently, her Dräger mask flutters with every desperate drag of air—PHUT-CLACK. She drops her head back against the brickwork, staring up at the dark sky.

"Jonas..." she whispers, her voice hollow, lost inside the rubber headpiece. "He just... he gave up."

"He didn't give up," I say, my voice raspy, dry as chalk. I wipe the slick combination of rainwater and chemical soot off my visor with my torn lab coat sleeve. "The poison uses what you miss most against you. If you're tired, if you're grieving... it gives you a reason to stop fighting."

Mara slowly turns her head to look at me. Her hazel eyes are dark, cold, and stripped of the fierce authority she had behind the pharmacy counter.

"You knew," she says flatly. Her voice carries a dangerous, quiet edge through her mask's speaker grill. "You knew what that gas was before you even walked up to my shutter door."

My stomach drops through my boots into the icy water beneath my feet.

"I told you," I stammer, backing up half a step, my left arm tightening around the yellow box. "I was a tech for Project Regen—"

"Don't lie to me again, Silas!" Mara snaps, pushing off the brick wall and taking a step toward me, her shotgun held low across her waist. "A tech doesn't carry a prototype 72-hour scrubber core with a biometric override matrix. A tech doesn't know the exact second count of the systemic conversion."

She points a wet, black-gloved finger straight at the Project Regen emblem stamped on my yellow case.

"My brother worked for the ministry," Mara says, her voice trembling with a mixture of cold rage and exhaustion. "Three weeks ago, he told me Project Regen wasn't building a disaster relief filter. He said they were testing an aerosol delivery system that used human respiratory cycles to propagate. He said the project had a lead systems engineer who signed off on the containment valves for Sub-Level 3."

She steps closer until the barrel of her shotgun is three inches from the yellow box in my arms.

"What's your full name, Silas?" she asks quietly.

The rain hits my mask in steady, rhythmic slaps. Tink. Tink. Tink.

I look down at the yellow box. I look at the blue light leaking through its sealed plastic seam. I think of the cold, clean computer labs on Floor 2. I think of the digital signature I typed into the terminal every night at eight o'clock to clear the pressure warnings.

Silas Brandt. Junior Systems Tech.

"Silas... Brandt," I say, my voice barely audible over the sound of the rushing water in the alley.

Mara doesn't move for three long seconds. The only sound between us is the wind howling through the narrow alley space and the steady hum of the scrubber unit fighting the rain.

"You built it," she whispers.

"I didn't design the gas!" I yell into my mask, the words tumbling out of my mouth in a frantic, desperate rush. "I maintained the pressure sumps! We were told it was a agricultural neutralization agent! We were told the tests were simulated!"

"You signed the seals," she says. It isn't an accusation anymore; it’s a death sentence pronounced in a flooded alley.

"If I hadn't taken this box," I choke out, holding the yellow case higher between us, "every person in the lower facility would have died in thirty seconds! This box is the only thing on this entire coast that can clean a room! It’s the only reason you and I are breathing right now!"

Mara looks from my eyes down to the box.

The red LED timer on the case reads: 71:14:02.

Seventy-one hours of clean air left. After that, the titanium core burns out, and the filter dies forever.

"Where does the box go?" Mara asks, her voice dropping all emotion, becoming cold and functional again.

"The high ground," I reply, wiping my dripping visor. "The regional broadcast tower on the ridge above the industrial district. It sits three hundred meters above sea level. The air there is thinner... the gas concentration won't be as dense. And if I can wire this scrubber into the tower’s main power array..."

"You can pulse the neutralization matrix over the whole city," Mara finishes for me.

"Yes," I say. "Or we stay down here in the canals and wait for our charcoal filters to rot."

Mara stares at me through her mask viewports for a long, agonizing moment. Slowly, she lowers the muzzle of her shotgun, turning to look down the flooded alleyway toward the main road.

Hauptstrasse is entirely underwater.

The dark sea water stretches out as far as the eye can see, turning the city of Greifswald into a drowned labyrinth of brick roofs, floating cars, and submerged streetlights. And out there, drifting through the grey drizzle above the water, thin plumes of pale green vapor rise from every second-story window.

The city isn't just flooded. It’s breathing.

"We move by the rooftops," Mara says, turning back to me. Her voice is flat, hard, and stripped of all hesitation. "No stopping. No talking. If your mask leaks, I don't wait for you. If my mask leaks, you take the shotgun and keep walking."

"Agreed," I say.

"And Silas?" She steps up close to me, her faceplate an inch from mine. "If that yellow box stops glowing before we reach the tower... I'm going to take your mask off myself."

She doesn't wait for a response. Mara turns, grabs the rusted iron ladder of a fire escape hanging from the side of the apothecary building, and begins to climb up into the dark drizzle.

I adjust the heavy plastic strap of the yellow box over my shoulder, locking the case tight against my ribs.

SKRRR-HHHH. SKRRR-HHHH.

I take one last drag of dry, charcoal-tasting air, reach up to double-check the bayonet mount on my intake filter, and reach for the rusted iron rungs of the ladder.