Flex Time: The Bunker Overhaul

Zone 17 Bunker control room. The vent hatch creaked open. A dull metallic clang echoed through the room as Lenia Bright climbed in. Her briefcase swung heavily at her side.

Ayla shot up from her camping chair like she'd been launched. "You're alive?! Are you hurt?!"

"No abnormalities."

Lenia set the briefcase on the camping table. Click. She unlatched it, and the lid sprang open—not with the room's orange glow, but a burst of golden light. Gold coins. Stacked on gold coins. Gold coins beside gold coins. The briefcase brimmed with tightly packed golden disks. Under the single white LED, the sun emblem on each coin reflected in unison, scattering golden flecks across the control room's drab concrete walls.

Ayla held her breath. I set down my coffee mug and picked up a single coin. Its weight pressed into my palm. Real. The imperial mint's stamp was crisp, the edge reeding uniform. No reason to mix in fakes with this volume, but checking was habit.

"2 billion gold received in full."

I dropped the coin back into the case. "Time to exchange."

I opened the The Last Survivor System shop. The [Material Exchange] interface.

I placed the entire gold-filled briefcase on the exchange slot. Its outline shimmered faintly, then began disintegrating from the edges into light—not melting like metal, but crumbling like grains of sand. Each coin broke down into particles and got sucked into the void. The SP counter started rolling.

It didn't stop. Ayla's mouth fell open. It stayed that way.

The coins' conversion accelerated. The briefcase's shape vanished as golden particles swirled in the air before being absorbed by the system.

The last coin dissolved into light. The counter slowed and locked in.

Higher purity than standard currency gave good initial rates, but the system penalized dumping massive resources at once. Not a slot machine—a tax. But no complaints. Nearly 100,000 SP. Four times what I'd made exchanging the Tear of the Sun. All-time high.

"N-Ninety… th-thou…"

Ayla's voice failed her. Her lips just moved.

"Lenia."

"Yes."

Lenia showed zero reaction to 2 billion gold evaporating before her eyes. Not a blink. She genuinely didn't care about money. Best employee ever.

I reopened the system shop and started typing keywords into the search bar.

"Mission results exceeded expectations. Time to upgrade gear."

Items began dropping from thin air.

Thud. Night-vision goggles. Monocular, head-mountable. 80 SP.

Thud. Lightweight tactical vest. Kevlar weave, 3A-rated ballistic protection. 350 SP.

Thud. Spare radio earpiece. Waterproof coating. 15 SP.

Thud. Tactical belt. Three mag pouches attached. 40 SP.

Thud. Tactical gloves. Half-gauntlet style, exposed fingertips. 20 SP.

The gear piled up on the camping table. I grabbed the tactical vest and tossed it to Lenia.

"Put it on."

Lenia caught it. She shrugged off her jacket with one hand and slipped the vest over her shirt. The Velcro fastened smoothly—muscle memory from knight training. She buckled the tactical belt around her waist, flipped the night-vision goggles up onto her forehead, gloved her hands and flexed her fingers once. Then she re-slung her tungsten sword harness over it all.

I stepped back to appraise the finished look. Bizarre. The tungsten sword's crude hilt jutted from her back, its leather straps overlaid with the matte black Kevlar weave of the tactical vest. Mag pouches dangled from the belt at her waist, night-vision goggles perched above her brow. Medieval knight gear fused with modern spec-ops kit on one body. A warrior from no era.

"…Huh. It actually suits you surprisingly well?"

Ayla tilted her head, impressed. "Not very knightly, but… there's something to it."

Lenia glanced down at herself. 0.3 seconds.

"No abnormalities."

No sentiments. No evaluation. Gear fit, no range of motion issues—that was enough. I nodded, satisfied. Total spend: 505 SP. Less than 1% of the gold exchange haul. Peak investment efficiency.

But this was just the opener. I spun my chair around and unfurled the system shop catalog.

"Alright. Now for the real shopping."

Ayla narrowed her eyes. "What else are you buying?"

"What've we been surviving on? One hydro generator and Spam cans. That era ends today."

My finger scrolled the catalog.

First: [Industrial Water Purification System (Reverse Osmosis, 500L Daily Capacity, 50-Year Filter Set Included) / 3,200 SP]. Purchased.

Light coalesced in midair. A matte stainless-steel frame with multi-stage filters materialized against one wall of the control room. 1.2 meters wide, 0.8 meters tall. Worlds apart from straining sewer water.

Hook this to the hydro generator's intake, and we'd have potable and wash water secured.

"…This makes clean water?"

Ayla touched the purifier. Cold, smooth metal. She gasped at her reflection on the stainless steel. "We can drink completely clean water in this bunker?"

"No more boiling sewage-stinking water. Done with that today."

Second: [Hydroponics Kit (Small-Scale, 24 Ports, LED Grow Lights Included) / 4,800 SP]. Purchased.

An aluminum frame with 24 grow ports in three tiers appeared. Violet LED grow lights embedded in each shelf. Nutrient pump, pH meter, timer—all integrated.

"What's this?"

"For growing veggies."

"…Underground?"

"LEDs replace the sun. Lettuce, spinach, green onions. First harvest in three weeks."

Ayla peered into an empty port. Sponge medium inside. Plant seeds there, and in three weeks—

"…No more just peeling potatoes?"

"We'll still peel potatoes. But now we have sides."

Ayla's eyes wavered. Memories of her first day, sobbing over a potato peeler.

Third: [Ventilation System Upgrade (Triple Filter: HEPA + Activated Carbon + UV Sterilization) / 2,400 SP]. Purchased.

A new unit encased the ceiling's rusty vent. The old corroded fan swapped for a high-efficiency, low-noise model with triple filters. I flipped the activation switch—

Vvvvvv.

The air changed. The bunker's perpetual heavy ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠sewage stench got sucked away. In 30 seconds, the control room's humidity and iron tang lifted. For the first time, I inhaled deeply without my gut churning. Clean air filled my lungs.

Ayla sniffed. "…No smell."

"Yeah."

"There's really no smell?!"

Ayla threw her arms wide and took a deep breath. Closed her eyes. Her lids reddened. What we'd endured since day one in the bunker. What we'd accepted as the fate of a shelter built over a sewer. Nights plugging our noses, breathing through our mouths, still retching ourselves to sleep. Gone in 30 seconds.

"…Boss."

"Don't cry. More to come."

Fourth: [Blast-Proof Hot Water Boiler (Electric, 200L Tank) / 3,600 SP]. Purchased.

A cylindrical stainless-steel boiler appeared against the back wall. Link the pipes to the purifier—

"Hot water?" Ayla's voice shook. "Boss, we haven't had a proper hot shower since we got here."

"I know."

"My hair reeks of sewer. Even Lenia—Lenia doesn't wear perfume into the vault because I—"

"I know."

Fifth: [Bunker Shower Booth (Foldable, Built-In Drain Trap) / 800 SP]. Purchased.

"Kyaahahaha!!"

Ayla's scream echoed through the bunker. She hugged the foldable shower booth faster than a Shadow Fang charge.

Sixth: [Solar Panels (Foldable, High-Efficiency, 200W) / 800 SP]. Mount on the vent exterior for backup power. End of the single-hydro era.

Seventh: [Industrial Battery Bank (Lithium Iron Phosphate, 5kWh) / 2,200 SP]. Extra backup to store surplus from solar and hydro.

Eighth: [Bunker ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Interior LED Lighting Panels (Full Spectrum, 12-Panel Set) / 600 SP]. We'd scraped by with three white bulbs. Half the control room always shadowed. Twelve panels mounted to the ceiling, and for the first time, every corner blazed bright. I ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠hadn't realized the concrete walls were this vast.

Ninth: [Insulation Mats (Cold/Moisture-Proof, Wall-Mount, 20㎡ Set) / 400 SP]. Stuck to the walls—no more chill to the touch. Condensation vanished. The perpetually damp concrete dried out.

Ayla slumped to the floor. No longer the camping chair—just the floor. Warm, dry, insulated floor.

"This… is still the same bunker?"

It was. Same Zone 17 Bunker. Concrete box over a sewer. But now, this box had flowing clean ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠water, hot showers, no stench, light in every corner, dry walls, and veggies soon to sprout.

Nothing SP couldn't buy.

I glanced at Lenia. She scanned the brighter control room. Her gaze moved: purifier to hydroponics, hydroponics to vents. 0.5 seconds each.

And—ever so faintly—she nodded. Once.

By her standards, that was near awe.

I swallowed my satisfaction and closed the system window.

"Good. Mission end for today."