The desalinization sands beyond Vault Delta were crackling beneath the afternoon haze, but Faris barely noticed. He was running drills in the relays for desalinization with a group of young keepers—standard procedure. The Hydration League ritualized every move: lift, seal, pressure-check, purge. Every move was choreographed to look like devotion.
Faris himself was worried, though. The sensor discrepancies were still keeping him up nights. Three days now and nothing from Central. Just "routine maintenance" and "log normalization.".
He was leaning over the basin intake valve, wrench in hand, checking a coupling that did not need tightening. That is where he noticed someone approaching—an older technician, tan vest, black visor down on his face. Faris noticed him only indistinctly from the lower decks, a man who rarely spoke.
The man did not lose speed as he passed, but when he swooped past Faris, his voice broke the heavy air in a whisper, barely audible over the hiss of the filters.
"The water is not safe. Don't trust the blue suits."
Faris whirled about, startled. "Wait—"
But the technician was already a full five meters down the corridor, striding with disciplined calm. Faris stood there, then began to move forward—
"Guardian 17!" bellowed the drill commander. "Concentrate!"
Faris froze. When he looked back again, the technician had stopped beside the oxidation chamber. Two enforcers in cobalt armor appeared out of nowhere and stood on either side of him.
"What did he do?" a voice breathed near at hand.
"Delinquency," a response drifted back. "Perhaps treason."
The technician did not fight. Did not run. He just stood, looking down, as the enforcers clipped metal cuffs on his wrists and led him away, boots crunching on solar-dried grit.
Faris's blood turned cold.
Something had shifted in the air—not merely data malfunctions today. Someone had uttered the unspeakable. And paid for it instantly.
---
That night, Faris could not sleep. He lay on the foam bed in his compartment, the ceiling screen blinking soft blue like a heartbeat. On his desk rested his father's wrench—its weight as normal as breathing—but tonight it felt heavier.
"The water is not safe."
The phrases themselves ran through his mind over and over like a stuck record.
What was the technician thinking? Not safe chemically? Contaminated? Had he been thinking of something altogether different, something more hazardous—something under filtration levels or pH readings?
Faris reached for his Logbook , accessed the system records for Vault Delta. The records were pristine. Too pristine. No anomalies. No warnings. As though nothing had happened. Nothing about the name of the technician. Nothing about an arrest.
He accessed a side maintenance session, the kind used by sweep teams and janitors. There—an anonymous entry, posted only minutes before the arrest of the technician.
"Someone's messing with the ratios. Look below ration line 23. This note won't make it through the hour."
He traced deeper, sweating palms. Ration line 23? That wasn't even in public circulation—it connected the tower's purification threads to Dome 4. A routed path. Only central engineers had the touch on it.
A sharp, stabbing buzz sliced through the air. The logbook screen flashed, stuttered, and went dark.
"Unauthorized trace detected. Logging interrupted."
Faris dropped the pad.
They were being traced.
He shut the blinds.
---
The next morning, Faris returned to the training grounds at dawn. Not to practice—but to observe. He walked the perimeter until he arrived at the oxidation chamber where the technician was waiting. He pretended to tie his boot as he gazed at the sand. Nothing.
Except—half-buried in the sand alongside the drainage grate—something glinted in the dust.
He released it.
A hydro badge, cut in half. The name had been erased, but the reverse side still bore a designation: MX-14A – Depth Crew.
Depth Crew. That was strange. Even within the League, not many worked the tunnels under Vault Delta—original construction, built when the domes were first raised. Only Faris's dad had ever spoken of those places.
Faris pushed the badge into his pocket.
When he returned to the mess hall, Layla was already seated at the corner table, hair in a braid, goggles still hanging around her neck. She looked up, frowning at the look of concern on his face.
"You look like you've seen a ghost."
"Worse."
He growled.
"Say it."
He swallowed. Then quietly: "Someone was kidn*pped yesterday. He threatened me. About the water."
Layla raised an eyebrow. "You mean like. pathogens?"
“No. Like corruption. Like something’s being hidden.”
She stared at him for a beat too long. Then she leaned in. “You’re not the only one wondering.”
That stopped him.
She pulled out her logpad from her sleeve and pages through records. "Every time I've taken a soil-to-vapor reading in Basin 9, I get trace discrepancies. Nanoparticles I shouldn't find. Biopolymers in accordance with factory waste. But the League's own scan results? Clean. Too clean."
"Fake logs?"
She nodded. "Or two alternative truths."
Faris pulled out the broken hydro badge and placed it on the table. "Depth Crew," he said. "He dropped it."
Layla reached for it, eye wary. "Depth Crew hasn't been functional in ten years."
"Maybe that is the cover story."
She smiled. "You really want to find out what lies beneath the Vault Delta?"
Faris didn't say anything. He didn't have to.
They both knew the drop had already begun.
---
That night, Faris ran into Layla again—this time in front of the mechanics bay. The lights of the corridor hummed gently, casting waves of darkness through the grates. No cameras in this part. Just old walls and older secrets.
Layla handed him a thermal cowl. "Put this on. There's backscatter tracking in the lower ducts. We need to conceal body heat."
Faris complied, tightening on the gear like second nature. They moved quickly, down the utility trench past Valve Corridor 6, deeper into the old cooling tunnels.
Layla stopped at junction F-9. She drew out of her jacket and extended a key—not electronic, but a bent, old-time brass imitation.
"Got it off Dune," she said. "Before he disappeared."
Faris blinked. "You knew Dune?"
"He was my cousin.".
The main click fell home, and the grate groaned open. Icy air puffed out of the shaft like a crypt's breath.
They entered.
It wasn't a tunnel—it was a network. Lush-furred pipes with dusted minerals. Old fiber lines alongside fungal bloom. The air smelled of salt and electricity.
"Depth Crew must've worked these tunnels," Faris panted.
"Or used this as a hideout," Layla replied.
They found the first glyph three meters deep—in the rust, carved with a filament torch:
✦ L3.A – DO NOT DRINK THE BLUE
Farther in, they discovered water drums. Empty. Scarred. One had a crude spigot left on it. Layla scanned across the rim.
"Triple-filtered lithium. But trace compounds… there's something off."
"What's in it?"
"Not from around here. These molecules. They're hybrid. Created. Synthetic biomass—something constructed.".
Faris kneeled beside a drum. Inside the lip were scuffed initials: F.U.—his father's mark.
He waited for air to come back into his lungs. "He was here."
Layla stepped back, her eyes wide. "Your dad?"
"He worked in the Depth Crew when I was a child. Said the vaults were holy. Said. One day I'd have it."
Another glyph—this one, new etched—glowed in the low torchlight:
VX INITIATED
DRIP IS THE LIE
FLOOD WILL CLEANSE
"f*****g hell is VX?" Layla gasped.
Before Faris could react, a growl of engines arose from behind them.
They turned.
Along the passageway, some fifty meters away, a drone was suspended—black, smooth, quiet. Its beam darted left and right like a living flashlight.
"Sector alert," a tinny voice came out of its casing. "Zone breach. Unauthorized human presence detected."
Faris grabbed Layla's hand.
"Run, come on."
They ran down the side tunnel, the drone's ear-piercing siren blaring into the depths.
—