Ключевые слова: abandoned, architecture, cable, channel, circulation, collector, communication, concrete, connect, connection, construction, corridor, crimea, dark, deep, dirty, duct, ducting, ductwork, dust, electrical, empty, exploring, factory, heat, heating, highvoltage, industrial, industry, inside, interior, lamps, line, main, mine, passage, pipe, pipeline, rusty, sevastopol, sewer, subterranean, subway, technical, tube, tunnel, underground, urban, ventilation, warm,