NOVELTY - The apparatus (1) has a power circuit connected to linear generators (3) to receive power output generated by the generators. A floatable semi-submersible compliant vessel (2) is adapted to be manipulatable by action of waves acting on an outer flexible membrane (6) between a steady-state condition where the generators are in neutral positions and a manipulated condition where the generators are compressed or elongated. The vessel is provided with a spring back unit (9) constantly forcing the generators towards the neutral positions and the vessel towards the steady-state condition.    USE - Wave energy conversion apparatus for converting wave energy into power output for generating waves by supplying power input to linear generators i.e. linear hydraulic pumps, and controlling mutual elongation and compression of the linear generators (all claimed).    ADVANTAGE - The apparatus efficiently converts wave energy from waves of varying sizes and waves coming from multiple directions. The floatable compliant vessel is formed with a self-supporting structure to perform energy conversion decentrally in each of the linear generators, thus ensuring structural integrity of construction without requiring additional support structure. The apparatus distributes external forces acting on the floatable compliant vessel throughout construction, so that the construction becomes dynamic. The apparatus generates wave energy from waves of varying sizes and waves coming from multiple directions as construction does not include a particular mode of operation or preferred pattern of movement, thus achieving efficient power production as different types of waves can be converted efficiently, and making construction to be robust towards wear and tear and with regard to sudden or momentary large impacting forces. The compliant vessel constantly moves under influence of waves without ending up in undesirable extreme positions due to dynamic character of the compliant frame structure is supported by the spring back unit constantly forcing the linear generators towards their neutral position, thus improving efficiency of energy conversion over a wide range of wave parameters adapted to exploit waves from multiple directions. The outer flexible membrane is watertight and encloses the compliant frame structure, so that water is prevented from entering an inner air filled space of the floatable compliant vessel, thus maintaining buoyancy and dry environment for equipment located in the inner space of the floatable compliant vessel. The apparatus controls manipulability of the compliant vessel by adjusting pressure inside the inner space.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a system for converting wave energy into power output.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a wave energy conversion apparatus in a steady-state condition with part of an outer flexible membrane excluded.    Wave energy conversion apparatus (1)    Floatable semi-submersible compliant vessel (2)    Linear generators (3)    Outer flexible membrane (6)    Spring back unit (9)