Ключевые слова: adventure, bag, cascade, cave, caver, cavern, caving, column, dark, deep, discovering, discovery, equipment, erosion, exploration, explore, formation, geologic, geological, geology, grotto, ground, headlamp, helmet, hole, inside, karst, lamp, light, limestone, man, mountain, natural, nature, potholing, rain, river, rock, science, speleology, spelunker, spelunking, stalactite, stalagmite, stone, stream, tunnel, underground, water, waterfall,