Ключевые слова: abyss, archaeology, canyon, cave, cavern, caving, cavity, corridor, czech, dark, darkness, deep, dungeon, entrance, exploration, explore, formation, geologic, geological, geology, gorge, ground, hill, hole, horizontal, inside, karst, labyrinth, mine, moravia, nature, outside, rock, scenic, stalactite, stone, tunnel, underground, unique, wild,