Ключевые слова: abandoned, architecture, background, building, candle, coal, concrete, construction, danger, dark, deep, dirty, duct, dungeon, ecology, empty, environment, industrial, inside, light, line, metal, metro, mine, mineral, mining, modern, mystery, nickel, ore, pipe, pipeline, rail, railroad, round, sewer, station, steel, stone, subterranean, subway, system, technology, transportation, tube, tunnel, underground, uranium, urban, water,