The town of Lower Owl lay abandoned for years. A silent horror hung over the streets, and the windows of the empty tenements resembled empty eyes. No one lived there, officially for safety reasons, unofficially - because everyone felt that something was wrong here. Adam and Lena were both seventeen years old and had very different reasons for turning up on that cool May evening at the overgrown gate leading to the old park. Adam was the son of a geologist who explored the surrounding caves. Lena the daughter of an archaeologist who was trying to find the remains of a former silver mine. Both of them, brought up in scientific environments, knew how to ask questions and were not content with easy answers. When their parents stayed up all night researching in a laboratory on the outskirts of town, Adam and Lena secretly walked over the fence. They sat down on a bench and talked about what they had heard among the adults - the old corridors, the trembling of the earth, the strange phenomena beneath the surface. - 'Did you know there's supposedly a network of tunnels under the park? - Adam began, looking at a blurry map on his phone. - I've heard. Only supposedly no one has found the entrance for years, not even archaeologists,' Lena replied, leaning over the screen. The creaking of leaves broke the silence. Behind an old bent bush, a slab of concrete appeared. Adam was the first to come closer and noticed that the edge of the slab was standing out slightly. Lena helped him lift it; a cool breeze hit their faces. - Are we going in? - Lena asked, and her voice was a little more confident than she felt. - 'Sure,' said Adam, though his heart was pounding hard. Inside it was semi-dark and damp. Their torches glided along the walls with carved marks that resembled drawings neither of them had seen in textbooks. The tunnel led deeper and deeper, time and again branching off like a maze. After several minutes, they found themselves at a wide door made of metal, covered with geometric patterns. Adam lifted his wrist to check the time - it was past midnight. Lena squatted closer, unable to take her eyes off the door. She looked at Adam and he looked at her - they both knew that no one before them had walked this way for many years. - 'Do you want to know what's next? - whispered Adam. - 'You live once,' Lena pressed her palm against the pattern in the middle of the door. The door trembled. The concrete beneath their feet pulsed with a soft light, and a quiet buzzing sound came from the depths of the tunnel, as if something was opening up that should not be allowed to exist. The air thickened and the geometric patterns glowed with a cold light. Adam and Lena looked at each other. The door slowly began to slide open, revealing a vast space where the air seemed to ripple and reality looked very different to anything they had seen before. Before they could take a step forward, a voice, unlike a human whisper, reached them from behind the illuminated portal, calling their names....