Ключевые слова: abandoned, cable, cable tunnel, cabling, collector, communication, connect, connection, construction, corridor, dark, deep, dirty, duct, dungeon, dust, electric, electrical, electricity, empty, engineering, fiber optic cable, gallery, heating, industrial, industry, interior, iron, light, lines, metal, mine, modern, nobody, old, passage, pipe, pipeline, railway, rust, rusty, service, subway, technical, tube, tunnel, underground, underpass, ventilation, wiring,