Ключевые слова: abandoned, black, cable, cave, cavern, coal, copper, corridor, dark, dig, dirty, door, energy, entrance, excavate, gate, geology, gold, historical, industrial, industry, inside, interior, iron, light, metal, mine, miner, mineral, mining, object, old, pipe, rail, railway, reinforce, rock, shaft, steel, tunnel, tunneling, underground, underpass, wet, wood,