You awaken in darkness. No daylight. No exit. Only cold rock, the echo of your footsteps – and the rustle of paper. Deep within a labyrinthine cave system, you come across the abandoned notes of Zac, a missing person who fell into the same abyss years ago. His words become your map, and you follow his fate step by step – and the closer you get to him, the blurrier the line between truth and madness becomes. Find paths where none should exist. Explore branching tunnels, solve environmental puzzles, and open hidden passages. Listen to every sound – something lives down here, and it hunts in the dark. Without weapons, you only have your wits, caution, and the faint glow of your light source. Will you escape? Or will you become the next echo wave in the depths?