Ключевые слова: canalization, channel, collector, concrete, corridor, creepy, danger, dark, decay, deep, dirt, dirty, drain, drainage, empty, environment, exploration, exploring, flooded, flow, glow, illuminated, industrial, industry, inside, light, mud, oviform, ovoid, passage, pollution, river, sewage, sewer, sewerage, sludge, smelly, splash, stinking, stone, storm drain, stream, subterranean, tunnel, turning, underground, urban, wastewater, water,