Ключевые слова: abstract, adventure, ancient, background, beautiful, cave, caving, dark, darkness, day, deep, discovery, entrance, environment, exploration, explore, geologic, geological, geology, hole, inside, landmark, landscape, large, light, mountain, mysterious, mystery, natural, nature, old, outdoor, place, rock, scene, scenic, speleology, stone, tourism, tranquil, travel, underground, view,