Ключевые слова: abstract, ancient, away, background, beautiful, beauty, big, black, cave, cavern, caving, corridor, dark, darkness, death, deep, earth, end, entrance, escape, exit, exploration, fear, formation, forward, freedom, geologic, geology, grotto, ground, hole, hope, inside, landscape, leaving, light, limestone, mountain, mysteriou, mystery, natural, nature, rock, stone, tourism, travel, tunnel, underground, wall, way,