Ключевые слова: abandoned, catacomb, channel, concrete, creepy, danger, dangerous, dark, darkness, death, decay, digger, dirty, draining, evil, exploration, explorer, gassy, heating duct, heating main, horror, industrial, inside, led headlight, light, male, man, maniac, mining, mystery, passage, person, pipe, pipeline, pollution, rusty, scary, sewage, sewer, sewerage, shaft, silhouette, speleologist, spooky, thriller, tunnel, underground, wastewater, worker,