ABT, Abandoned Biomechanical Tunnel, a long cylindrical underground corridor built from fused metal ribs, pipes, and organic-like mechanical structures, dense bundles of cables and conduits covering the industrial biomechanical wall and ceiling like veins, dark worn steel surfaces, grime, oil stains and corrosion, narrow maintenance walkway with metal floor panels and drainage grates, scattered loose cables on the ground, damp reflective surfaces, warm amber utility lights embedded in the walls, dim cold light shafts filtering from broken ceiling panels. On the right side, further down the tunnel, recessed circular alcove opens in the wall, containing a cluttered control station. Deep atmospheric perspective fading into fog, moody sci-fi lighting, high detail, gritty dystopian environment, claustrophobic tunnel interior, abandoned industrial alien technology aesthetic, cinematic depth, volumetric haze, ultra-detailed mechanical textures.