Ключевые слова: cavern, construction, corridor, dig, digger, energy, engineering, enormous, entrance, fabulous, fantastic, fantasy, galactic, galaxy, gallery, gate, gates, gateway, hard, historical, impressive, inconceivable, incredible, industrial, industry, iron, machine, machinery, military, new world, outer space, portal, power, sci, space, space station, star, starlight, tremendous, tunnel, tunneling, unbelievable, underground, underpass, unthinkable, war, warfare, wartime, work,