NOVELTY - The device has two slideably-joined parts including a piston (12) and a cylinder (10), where one of the parts is provided with a component providing for different accelerations of the parts when caused to rise and fall by passing waves. The parts include rotating panels (16), which resist upward motion of the part on wave upslope, where the device is not directly secured to earth. The piston and cylinder include a pumping apparatus (36) assuming a different position with respect to each other in which a pumping cycle for adjacent devices provides a continuous flow of pressurized water.    USE - Underwater hydraulic pressure-generating device.    ADVANTAGE - The device allows ensuring a net buoyancy of a buoy with underwater component mass to be barely sufficient to lift the piston inside the cylinder when confronted with an above-average amplitude and steepness wave such as a wave measuring feet from wave trough to peak with period of 8 seconds. The device allows upward force to be transmitted to the entire pump unit and the horizontal hydraulic pressure lines when the piston reaches the top of effective stroke inside the cylinder, thus reducing the chances of excessive wave force causing damage. The device allows net reduction of carbon dioxide molecules in the upper ocean to provide a pathway for the ocean to absorb atmospheric carbon dioxide so as to reduce atmospheric heat gain. The device allows the panels to enhance upwelling to generate marine life. The device allows a pump assembly to be provided with cushioning flow control to prevent the piston from damaging the cylinder when subjected to a large wave.    DETAILED DESCRIPTION - The component is a buoyancy adjustment component. INDEPENDENT CLAIMS are also included for the following:    (1) a hydraulic wave energy system    (2) a wave energy system    (3) a subsea method for storing and releasing energy using weight inside a cylinder.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a moveable connecting point buoy force generation at down slope of a wavefront.    Cylinder (10)    Cable (11)    Piston (12)    Rotating panel (16)    Pumping apparatus (36)