Ключевые слова: background, blue, bore, boring, car, closeup, construction, deep, dig, drill, drilling, drilling rig, earth, earthwork, energy, engineering, equipment, exploration, field, fuel, gas, geology, ground, hard work, heavy, hole, industrial, industry, machine, machinery, mechanical, minerals, mining, natural, nature, north, oil, outdoors, pipes, power, rig, site, sky, soil, subsoil, technology, vertical, water, work,