Ключевые слова: abandoned, adit, cave, cavern, chamber, coal, corridor, creepy, danger, dark, deep, dirty, drift, dungeon, environment, exploration, flood, flooded, flooded mine, geology, gloomy, hazard, industrial, industry, inside, iron, limestone, mine, mineral, mineralogy, mystery, old, ore, passage, pollution, reflection, rock, scary, spill, spooky, stone, subterranean, toxic, tunnel, tunneling, underground, waste, water, way,