The present invention provides a prime mover driven by buoyancy for generating a power which comprises a water tank for containing a certain amount of water; a buoyancy-generating unit in the water tank with a part of the buoyancy-generating unit immersed in the water, the buoyancy-generating unit being revolved by a continuous expansion and shrinkage of a tube, the tube being expanded near a bottom dead center and then shrunk above a surface of the water; and a control unit for controlling the expansion and shrinkage of the tube, the control unit being connected to the buoyancy-generating unit by a shaft and disposed at an outside of the water tank.
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