Ключевые слова: abstract, architecture, cave, channel, concept, concrete, construction, corridor, danger, dark, death, deep, dirty, drain, ecology, empty, environment, environmental, flow, flowing, hole, industrial, industry, inside, mud, mystery, passage, perspective, pipe, pipeline, plant, pollution, river, round, sewage, sewer, sewerage, splash, stream, subterranean, technology, tube, tunnel, underground, urban, view, voronezh, wall, wastewater, water,