Part I
The door closed behind them with a heavy metallic thud.
None of the three men looked back.
The corridor ahead was narrower than anything they had passed through before. The ceiling hung lower, forcing exposed pipes and thick bundles of old cables to crowd the space above their heads. Layers of faded warning paint peeled from the concrete walls, revealing older markings beneath.
The air felt heavier.
Cooler.
Almost damp.
Carlos shone his flashlight down the corridor.
“I’ve never been this far.”
Gonzales wasn’t surprised.
“Almost nobody has.”
Titus looked around.
“If this place existed, why wasn’t it on the maps?”
“It probably was.”
Titus looked at him.
“Then where is it?”
Gonzales gave a tired smile.
“That’s the question.”
The corridor stretched on in silence.
No machinery.
No ventilation.
Only the quiet splash of boots against the thin layer of water that now covered parts of the floor.
Not enough to slow them.
Just enough that every step echoed.
Carlos looked down.
“The water’s getting deeper.”
“Only by a few millimetres.”
“It wasn’t here ten minutes ago.”
Nobody argued.
Because that was true.
Somewhere else in Black Sun…
Captain Vale’s remaining squad advanced through an abandoned research wing.
Five soldiers now.
One fewer than before.
No one mentioned the missing operator.
No one wanted to explain where he had gone.
The silence between them had become almost as uncomfortable as the facility itself.
The engineer checked his handheld terminal again.
“Still nothing?”
Vale asked.
The engineer shook his head.
“No maps.”
“No signals.”
“No command.”
He lowered the device.
“It doesn’t even know where we are anymore.”
Vale looked ahead.
“Then we keep moving.”
Several floors above, six researchers remained inside the emergency shelter.
The door had been closed again.
Locked manually.
Nobody had seen what had opened it.
Nobody wanted to discuss it.
A young biologist sat against the wall, staring at the floor.
“This doesn’t make sense.”
An older physicist looked over.
“What doesn’t?”
“The rules.”
“They’re just emergency procedures.”
“No.”
She shook her head.
“They read like someone already knows what’s about to happen.”
Nobody answered.
Because everyone had thought the same thing.
Far below…
Titus suddenly stopped walking.
Carlos almost walked into him.
“What?”
Titus held up a hand.
“Listen.”
The three men stood perfectly still.
Nothing.
Not a single sound.
Carlos frowned.
“I don’t hear anything.”
Titus continued listening.
“…Exactly.”
The silence felt unnatural.
Black Sun was never truly silent.
There were always fans.
Pumps.
Electrical systems.
Something.
Here…
There was nothing.
Not even the sound of moving air.
Gonzales quietly spoke.
“Keep walking.”
Nobody asked why.
They simply obeyed.
Their footsteps echoed through the corridor.
One.
Two.
Three.
Then…
A fourth.
Carlos stopped.
The extra step stopped too.
The three looked at one another.
Nobody had spoken.
Nobody had turned around.
Titus slowly inhaled.
“You heard that.”
Carlos nodded once.
Gonzales stared straight ahead.
“Walk.”
The word came out barely above a whisper.
So they walked.
One.
Two.
Three.
Four.
The fourth step returned.
Always just behind them.
Perfectly matching their pace.
No faster.
No slower.
Carlos’s breathing became shallow.
“Don’t.”
Gonzales said.
“Don’t count them.”
The footsteps continued.
Five people walking.
Except…
There were only three.
Elsewhere…
Captain Vale’s squad reached an intersection.
The corridor split into four directions.
The soldiers examined each route.
Then the engineer quietly spoke.
“Captain.”
Vale looked over.
“I think someone’s following us.”
Nobody moved.
Nobody turned around.
The captain remembered the first rule.
Every member of his team remembered it.
For several seconds…
No one said anything.
Then the footsteps stopped.
The engineer whispered,
“…They’re gone.”
Vale answered without looking back.
“Were they ever there?”
Silence.
No one knew.
The squad continued forward.
Not because they felt safe.
Because standing still suddenly felt much worse.
Back with Titus…
The footsteps vanished.
Without warning.
Without fading away.
Simply…
Gone.
The three men kept walking for another minute before Carlos finally spoke.
“…I hate this place.”
Titus managed a weak smile.
“I think Black Sun hates us more.”
Nobody laughed.
Because it no longer sounded like a joke.
Ahead…
The corridor disappeared into darkness.
Behind them…
The silence remained.
Waiting.
Part II
No one spoke for several minutes.
Not because they had nothing to say.
Because talking felt…
Unsafe.
The footsteps had stopped.
That should have been comforting.
Instead, it made the silence feel heavier.
Titus found himself listening to every sound his own body made.
His breathing.
His clothes brushing against the wall.
The quiet splash of water beneath his boots.
It was impossible to stop listening.
The silence demanded attention.
The corridor widened into an old equipment junction.
Rows of rusting pipes disappeared into the ceiling, while abandoned maintenance carts stood exactly where someone had left them years ago.
Nothing looked disturbed.
Nothing looked broken.
It was simply…
Empty.
Carlos swept his flashlight across the room.
“Clear.”
The beam passed over dusty shelves.
Old electrical cabinets.
A collapsed ladder.
Then…
It stopped.
“What?”
Titus asked.
Carlos frowned.
“I thought I saw someone.”
The light returned to the same spot.
Nothing.
Only an old cabinet casting a long shadow.
“…Forget it.”
Nobody challenged him.
At this point, everyone had started doubting what they saw.
Several sectors away, the researchers finally decided to leave the emergency shelter.
Remaining inside suddenly felt like a worse decision than moving.
The oldest among them carefully unlocked the door.
“Stay together.”
The others nodded.
The hallway outside remained empty.
They stepped into it one by one.
The door quietly closed behind them.
Nobody touched it.
The group froze.
One researcher slowly reached back.
The handle wouldn’t move.
“We’re locked out.”
The biologist stared.
“But we just came from there.”
No answer.
Their safe room had become inaccessible.
There was nowhere to return to.
Captain Vale’s squad entered another service corridor.
Water dripped steadily from a fractured pipe overhead.
The droplets echoed through the passage.
Drip.
Drip.
Drip.
The radio operator quietly looked upward.
“That pipe wasn’t leaking earlier.”
The engineer checked the ceiling.
“It shouldn’t be leaking at all.”
The pipe carried electrical conduits.
Not water.
Nobody wanted to think about that.
They continued walking.
Then…
Drip.
Drip.
Drip.
The sound changed.
It wasn’t above them anymore.
It was ahead.
Vale stopped.
The entire squad halted instantly.
The dripping stopped.
The captain waited.
Nothing.
He took another step.
Drip.
Behind them.
Every soldier froze.
Nobody turned around.
The engineer whispered,
“…Captain.”
“I know.”
“What do we do?”
Vale looked straight ahead.
“We keep walking.”
“But—”
“We keep walking.”
His voice was firmer this time.
Not because he was certain.
Because uncertainty was spreading through the squad.
Someone had to sound confident.
Even if it was an act.
Far below, Titus noticed something odd.
The emergency lights were no longer blinking.
They had settled into a steady glow.
Almost inviting.
The corridor ahead looked…
Comfortable.
Warmer.
Cleaner.
Carlos looked toward it.
“That’s strange.”
“What?”
“The lights.”
Titus nodded.
“They’re brighter.”
The three men immediately stopped.
No one needed to say it.
Rule Four.
If you notice the lights becoming brighter, leave the area immediately. Do not look toward the source.
Carlos slowly lowered his flashlight.
“What now?”
Gonzales looked around.
“There.”
A narrow maintenance tunnel branched away from the illuminated corridor.
It was darker.
Smaller.
Less stable.
Without another word, they squeezed inside.
As they entered the cramped passage, Titus couldn’t help himself.
For the briefest moment…
He looked back.
Not toward the source.
Only toward the corridor.
The bright light at the far end seemed almost…
Natural.
Comforting.
Like daylight.
Then something moved inside it.
Not clearly.
Not enough to identify.
Just…
A silhouette.
Standing perfectly still.
Watching the corridor.
Titus immediately turned away.
His heartbeat thundered in his ears.
“What?”
Carlos asked.
Titus shook his head.
“Nothing.”
He wasn’t lying.
Because he genuinely wasn’t sure if he had seen anything at all.
Elsewhere in Black Sun…
A lone maintenance supervisor hurried through a utility passage.
He had become separated from the others during the evacuation.
His radio had long since stopped working.
His flashlight was beginning to fail.
He stopped.
“…Hello?”
No answer.
He took another step.
His own footsteps echoed loudly.
Then…
Another pair joined them.
He froze.
The extra footsteps stopped too.
His breathing became ragged.
“Who’s there?”
Silence.
He squeezed his eyes shut.
“No…”
He remembered the first rule.
He began walking again.
The footsteps returned.
Steady.
Patient.
Always behind him.
Tears filled his eyes.
“Please…”
He kept walking.
The footsteps stayed with him.
Until suddenly…
They didn’t.
The silence returned.
The supervisor almost collapsed in relief.
Then a voice quietly spoke beside his ear.
“You looked.”
The lights in the corridor went out.
His scream echoed briefly through the passage.
Then…
Nothing.
Deep below, Titus stopped walking.
Carlos looked around.
“Did you hear that?”
A distant scream.
Barely audible.
Carried through pipes and concrete.
Then silence again.
Gonzales closed his eyes.
“They’re learning.”
Titus looked at him.
“Who’s learning?”
Gonzales slowly opened his eyes.
“I don’t know.”
A pause.
“…And that’s what frightens me.”
The three men continued downward, while somewhere else in Black Sun…
The silence claimed another victim.