(US5329497-A)      At least one extendable pumping element (10) attached to fixed float (34) has at least one gas- and/or fluid-impermeable hose (12). The hose expands radially while shortening in the longitudinal direction and has one inlet and/or outlet opening for at least one hydraulic and/or pneumatic pressure medium (24). On each hose (12) lie flexible longitudinal fibres (14) of high tensile strength, which run preferably parallel when extended.    The fibres (14) have an upper force attachment (16) connected to the float (34) and a lower force attachment (18) connected to a fixing (38). The tensile force (Z) is applied in the longitudinal direction of the pumping element (10) and never to a hose. Ideally the fibres (14) are arranged in guide rings (20) at regular intervals.    USE -   As energy source for electric power station, water supply, water storage, mixing and aeration of standing water and desalination of sea water.    (JP6213134-A)      Power is generated by an extensible pump (10) suspended from a float (34) anchored in the water. The pump comprises a gas- and water-tight hose (12), which expands in the radial direction on being shortened, and with inlet and outlet ports for a pneumatic and/or hydraulic medium under pressure.    Flexible, long, high-tensile fibres (14) bear against the hose, and have top and bottom components (16,18) secured to the float and an anchor (38). Thus any tension load in the lengthwise direction does not act on the hose.    USE/ADVANTAGE -   For use on sea waves. It is practical, cost effective and has no ecological drawbacks. It is simple and requires minimum use of corrodible materials.    (ZA9307182-A)      Power is generated by an extensible pump (10) suspended from a float (34) anchored in the water. The pump comprises a gas- and water-tight hose (12), which expands in the radial direction on being shortened, and with inlet and outlet ports for a pneumatic and/or hydraulic medium under pressure.    Flexible, long, high-tensile fibres (14) bear against the hose, and have top and bottom components (16,18) secured to the float and an anchor (38). Thus any tension load in the lengthwise direction does not act on the hose.    USE/ADVANTAGE -   For use on sea waves. It is practical, cost effective and has no ecological drawbacks. It is simple and requires minimum use of corrodible materials.