Ключевые слова: adventure, ancient, backpack, black, cave, cavern, caving, colorado, dark, darkness, earth, entrance, exploration, explore, explorer, exploring, extreme, geologic, hole, human, inside, light, mountain, mysterious, mystery, natural, nature, people, person, rifle, rock, shadow, silhouette, spelunking, stalactite, stalagmite, stone, torch, travel, tunnel, underground, walking, wall, woman,