Ключевые слова: beam, cave, corridor, deep, depth, destination, digging, disuse, dripping, engineering, europe, extracting, extraction, famous, gallery, geological, geology, grot, grotto, history, industrial, industry, inside, krakow, landmark, mine, mineral, mining, old, poland, potash, saline, salt, salty, speleology, structure, tourism, tunnel, underground, wieliczka, wood, wooden,