A mechanical structure used for extracting energy from oscillating marine waves is submitted. The apparatus comprises a plurality of buoyant tanks connected by a plurality of horizontal outriggers through a hinge assembly to a vertical frame located between the buoyant tanks. Marine waves create a pitching motion in the tanks forcing the outriggers to ascend and descend causing the vertical frame to rotate perpendicularly along the horizontal axis of the hinge. The power extraction system is comprised of a plurality of hydraulic cylinders connected to the vertical frame and outriggers. The pitching motion of the buoyant tanks and outriggers produce a vertical rotation along the horizontal axis of the hinge in the vertical frame, which forces contraction and expansion of the hydraulic cylinder assembly, thus extracting power from the relative motion between the members.