Ключевые слова: arched, canal, canalization, channel, collector, concrete, convex, corridor, creepy, danger, dark, decay, deep, dirt, dirty, drain, drainage, empty, environment, escape, exploring, flow, glow, illuminated, industrial, industry, inside, light, mud, pipe, pipeline, pollution, reflection, river, sewage, sewer, sewerage, sludge, smelly, stinking, storm drain, stream, subterranean, tunnel, underground, urban, vaulted, voronezh, wastewater, water,