Abstract: A drilling device is disclosed which comprises a tubular drilling lance adapted to being lowered to great depths in the earth's surface and being raised therefrom. Disposed within the drilling lance is an energy generating system which comprises a fluid vaporizing system and a turbine coupled to the vaporizing system by a closed fluid circuit. Coupled to the turbine and extending outwardly from the drilling lance is a drill bit. The drilling device is configured such that vaporized fluid activates the turbine, which in turn, makes the drill bit operable.