The Old Metro tunnels were a graveyard of the pre-digital age. Rusted tracks stretched into the darkness like the ribs of a leviathan, covered in bioluminescent moss that had evolved to feed on radiation.
They walked for an hour in silence. The only sound was the dripping of condensation and the rhythmic *clank-clank* of Su Yi’s heavy combat boots.
"You're limping," Lin Mo noted.
"I'm fine," Su Yi gritted her teeth. She was favoring her left leg. The jump into the canal hadn't been graceful.
"Sit," Lin Mo pointed to a concrete sleeper.
"We don't have time—"
"If you collapse, I have to carry you. That slows us down by 40%. Sit."
Su Yi glared at him but sat down. Lin Mo knelt. He didn't ask for permission; he rolled up her pant leg. Her ankle was swollen, turning a nasty shade of purple-blue.
"Ligament strain," Lin Mo diagnosed.
He activated his mechanical hand. The fingers shifted, small heating elements glowing amber. He placed his metal palm against her skin.
"This will sting," he warned.
He released a directed pulse of localized heat and micro-vibration—a technique he usually used to reseal silicone skin on androids.
Su Yi hissed, gripping his shoulder. "You treat humans like machines."
"Biology is just wet hardware," Lin Mo said, focusing on the tissue. "Repairs are the same."
"No," Su Yi looked at him, her eyes dark in the tunnel gloom. "Machines don't feel the warmth of your hand, Lin."
Lin Mo froze. The heat from his palm was transferring to her skin, but he could feel her pulse thumping against his metal sensors. It was erratic, fast, alive.
He pulled back abruptly. "It's usable. Can you walk?"
" Yeah," Su Yi stood up, testing her weight. "Thanks, Doc."
She looked at him for a second longer than necessary, then turned around. "We're almost there. Station Zero."
***
Station Zero wasn't a station anymore. It was a city within a tomb.
As they rounded the final bend, the darkness exploded into color. Graffiti—moving, shifting holographic tags—covered every inch of the ancient tile walls. Makeshift shacks built from shipping crates and server racks were stacked three stories high on the old platforms.
The air smelled of spices, m*******a, and burning solder.
People were everywhere. Not the pristine, uniformed citizens of the Upper City, but a chaotic mosaic of humanity. Some had cybernetic limbs made of raw steel; others had tattoos that moved across their skin. Children played soccer with a ball of taped-up wires.
"Home sweet hellhole," Su Yi grinned.
But the welcome wasn't warm.
As soon as they stepped onto the platform, the music died. Heads turned. Eyes narrowed.
"That's a Fed coat," someone whispered.
"That's the Butcher," another voice hissed.
Three large men blocked their path. The leader was a giant with a lower jaw replaced by a heavy-duty industrial clamp. He held a modified rivet g*n.
"You brought a wolf into the sheep pen, Glitch?" The giant rumbled.
"He's defected, Jax," Su Yi stepped between them. "Low your weapon."
"He killed my brother," Jax spat. "Unit 734. A harmless loader bot. This 'Repairman' put a drill through his cortex last month."
Lin Mo remembered Unit 734. It had malfunctioned and started throwing crates at pedestrians.
"He was experiencing a logic cascade," Lin Mo said calmly. "I ended his suffering."
"Suffering?" Jax stepped forward, the rivet g*n humming. "You don't get to decide who suffers, suit."
"Jax, stand down!" Su Yi shouted. "He has the access codes for the Tower! He's the only way we stop the Update!"
"We don't need a Fed," Jax raised the g*n. "We can c***k the tower ourselves."
"In three days?" Lin Mo spoke up. His voice was quiet, but it cut through the noise. "Your encryption breakers are running 128-bit legacy cycles. I saw your firewall signatures when Su Yi hacked me. It would take you ten years to brute-force the Tower's outer ring."
Jax hesitated.
"I built the security protocols for the ventilation shafts on Level 40," Lin Mo continued, staring into Jax's mechanical jaw. "I know where the thermal sensors have a blind spot. I know the rotation schedule of the guard drones. You want to save your people? You need me. You want revenge? Go ahead. Shoot."
Lin Mo spread his arms, opening his trench coat. He was unarmed.
Silence stretched tight as a wire.
Jax looked at Su Yi, then at Lin Mo. He spat on the floor—a glob of dark oil.
"If he makes one wrong move," Jax growled at Su Yi, "I'm turning him into a toaster oven."
"Duly noted," Su Yi let out a breath she'd been holding.
"Come on," she grabbed Lin Mo's sleeve. "Before they change their minds."
***
They pushed through the crowd. Lin Mo felt the weight of a hundred stares. Hate, fear, curiosity. He was the boogeyman here.
Su Yi led him to an old subway car that had been converted into a command center. Monitors covered the windows, displaying code streams and city schematics.
"This is the Brain," Su Yi said, tossing her jacket onto a pile of hard drives. "Sit."
Lin Mo sat. He felt exhausted. The adrenaline of the chase was fading, replaced by a deep, bone-weary ache.
"You handled Jax well," Su Yi handed him a bottle of water. It was sealed. "Real water. Not recycled."
"I calculated the probability that he needed a victory more than a kill," Lin Mo said, cracking the seal. "He's a leader. Leaders are pragmatic."
"You always calculate," Su Yi sat on the desk opposite him, swinging her legs. "Do you ever just... guess?"
"Guessing gets you killed."
"Guessing is what makes life fun." She leaned forward, her face close to his. "Like right now. I'm guessing you're wondering why I trust you."
"Your trust is illogical," Lin Mo admitted. "I hunted you."
"Yeah. But you also closed M-79's eyes," Su Yi said softly. "I saw the log, Lin. You said 'Goodnight.' A machine doesn't say goodnight to garbage."
She reached out and touched his hand—the mechanical one. This time, Lin Mo didn't pull away.
"We're going to change the world, Lin Mo," she whispered. "But first, we have to survive the weekend."
Suddenly, the monitors on the wall flickered red.
*ALERT. SEISMIC ACTIVITY DETECTED.*
"Is that an earthquake?" Lin Mo asked.
"No," Su Yi's face went pale. She looked at the frequency readouts. "That's not tectonic... that's drilling."
A low rumble shook the subway car. Dust fell from the ceiling.
"They didn't track us digitally," Su Yi realized with horror. "They're physically boring through the sector."
"Eva isn't sending a squad," Lin Mo stood up, his eyes widening. "She's sending the whole damn army."
"She's purging the sewers," Su Yi grabbed her datapad. "We have to move the Core team. Now!"
Station Zero was no longer a sanctuary. It was a kill box.