Ключевые слова: abandoned, adit, byaki, cave, cavern, corridor, creepy, danger, dark, deep, dungeon, exploration, flooded, formation, geology, grove, hazard, inside, interior, light, limestone, long, mine, miner, mineralogy, minerals, mining, mold, mould, must, mustiness, mystery, natural, nature, nickel, old, ore, passage, quarry, rock, scary, science, speleology, spooky, stone, structure, tula region, tunnel, underground, water,