Ключевые слова: black, cave, coal, coal mine, coal miner underground, coal miners, coalmine, column, concrete, construction, corridor, dark, deep, dig, dirt, dungeon, energy, entrance, geology, hot oak, industrial, industry, inside, job, lamps, level, metal, mine tunnel, miner, passage, poland, profession, railway, rock, sztygarka, technology, training mine, traning mine, tunnel, tunneling, underground, underpass, woody, worker,