Many thousand of years B.C., climate in North Africa was mouch more humid than today. Seasonal rains were falling regularly over vast green prairies and over lakes, rivers and inland seas of fresh waters. Several empires that have inherited sophinticated technology knowledge from earlier Civilizations, inhabited the lands and seas now hidden under the Desert sands. They know how to fly with machines, and his metallurgy was very developped in those times. The fuel to feed his fires was harvested from vast plantations, and not extracted from the Earth.