Ключевые слова: architecture, background, canal, channel, chemical, city, collector, concrete, contaminated, contamination, corridor, danger, dark, deep, dirt, dirty, drain, drainage, ecology, environment, environmental, flow, flowing, industrial, industry, inside, liquid, mud, mystery, nature, old, pipe, pipeline, pollution, river, sewage, sewer, sewerage, stream, subterranean, tube, tunnel, underground, urban, waste, wastewater, water,