Keller 2

abandoned, decaying underground cyberpunk research facility and prison complex. Dark atmospheric sci-fi horror mood, rusted floor, exposed wires, leaking pipes, green puddle reflections. Left side: labyrinth of ruined office rooms, fallen desks, destroyed server racks, ventilation ducts. Middle section: long claustrophobic corridors with rows of empty containment cell doorways, guard kiosks. Right side: large research laboratory with broken glowing green bio-hazard tanks, broken glass, medical consoles. Dystopian, haunted, gritty textures, high contrast, clean flat lighting, no grid lines, no UI, no text.