Keycard access. Biometric locks. Guards posted at every corridor.
Inside, the lab lights reflected off steel tables and glass chambers. Samples from the extermination zone lay cataloged and separated—runner muscle tissue, bloater residue scraped from concrete, fragments of acid-burned bone.
No live subjects.
Only evidence.
A senior researcher stood at the central display, arms folded.
"Run the comparison again," she said.
Data scrolled across the screen—cell structures, protein chains, metabolic rates.
A junior analyst frowned. "The changes aren't uniform."
"How so?" another asked.
"Runners show increased muscle fiber density," he said. "Faster contraction. Less endurance. They burn out quicker."
The senior researcher nodded. "Extreme speed at the cost of longevity."
"And bloaters?" someone asked.
The display shifted.
"They're metabolically unstable," the analyst replied. "Their bodies can't sustain the chemical buildup. Pressure increases until rupture."
"So they explode because they can't hold it," another researcher said.
"Yes," he replied. "Not because they're meant to."
Silence settled.
Another analyst brought up a graph.
"Infected density spikes," she said. "Then crashes."
"Because they cluster," the senior researcher said. "Crowding accelerates mutation stress."
She pointed to the data.
"Too many bodies in one area means faster spread of chemical byproducts. Some mutate for speed to escape pressure. Others swell until failure."
"So runners thin crowds by movement," someone said.
"And bloaters thin them by… collapsing."
"Yes," the senior researcher replied. "It's not planning. It's biology breaking under load."
A technician hesitated. "The bloater acid—its base structure resembles the chemical residue from the original site."
"That doesn't mean design," the senior researcher said firmly. "It means origin."
She tapped the screen.
"The initial compound damaged human physiology. What we're seeing now is mutation trying to survive that damage."
Another researcher whispered,
"And failing."
"Yes," she said. "Violently."
She stepped back from the display.
"There's no control here. No intelligence. Just systems collapsing in different ways."
A quiet alarm chimed.
RUNNER VARIANT – ADDITIONAL MUSCLE TEARING OBSERVED
The senior researcher exhaled slowly.
"They're burning themselves out faster," she said. "Which means mutations will keep appearing."
"How many?" someone asked.
She didn't answer immediately.
"Until the environment stabilizes," she said finally. "Or until nothing is left to mutate."
The room went silent.
Another technician spoke quietly. "Command is asking for an assessment."
The senior researcher straightened.
"Tell them this," she said.
"This isn't an enemy adapting to us."
"It's a disease tearing itself apart—
and taking everything else with it."
She looked at the city through the glass.
"And the worst part?"
Everyone waited.
"There's no final form," she said.
"Only worse ones."
Unit Three deployed at dusk.