Three dental students slip beneath an abandoned university building and find a hidden city ruled by carious bacteria. What waits in the dark is far stranger than any campus legend.
It was one of those summer nights when the city seemed to hold its breath. Under the old university department, beneath layers of dust, rusted pipes, and forgotten concrete, Ania, Olek, and Bartek moved slowly through the abandoned underground passageways.
For weeks there had been whispers. Strange lights. Soft clicking sounds after midnight. Laboratory samples of carious bacteria, sealed and logged, had vanished without explanation. Ania called it superstition dressed up as science. Olek called it a bad coincidence. Bartek, who had heard enough to stop laughing, only said they should see for themselves.
Their torches cut narrow tunnels through the dark, picking out cracked tiles, damp brick, and old warning signs half swallowed by mildew. The air grew heavier the deeper they went, carrying a sour, clinical smell that made Olek think of incubators and sterilised trays. Then his boot scraped against something hidden in the floor.
He looked down. A panel had shifted beneath his weight.
Before anyone could stop him, it gave way with a dry metallic sigh.
Cold air rushed up from below.
The opening yawned beneath them like a throat. One by one, they climbed down into a passage none of them had expected to find. The walls changed there. The brickwork was filmed with pale deposits that looked disturbingly like plaque, and the surfaces bore strange, brush-stroked patterns, as if some unseen hand had been painting in the dark with a toothbrush.
They followed the tunnel until it widened into a chamber so large their torches could not reach the ceiling.
In the centre stood a colossal structure shaped like a tooth, white in places, rotten in others, towering over a crowd of tiny moving figures. Hundreds of them clung to its sides, swarming over the surface with frantic purpose. Bacteria. Not abstract shapes from a textbook, but living forms with slick bodies, twitching filaments, and little tools clutched in their microscopic hands.
Ania stopped breathing for a second.
Then a whisper rippled through the chamber.
"People... people have come."
From the shadows, a figure slid forward, larger than the rest. She wore a coat woven from dental floss and a crown made of enamel fragments. In one hand she held a narrow object that glinted like a syringe filled with toothpaste.
"Newcomers," she said, her voice thick and bubbling, "you have arrived at an inconvenient time. You can help us reach the surface... or your jaws will become our next territory."
No one moved.
The three students stood in the glow of their torches, with no weapons, no protection, and no idea what had just awakened beneath the university.