The dual rotor turbine configuration efficiently harnesses oceanic wave energy within an oscillating water column system. The up and down movement of the waves creates a bi-directional pneumatic airflow which spins the twin turbine assemblies. The resulting rotary force is then utilized to drive two electrical generators simultaneously. Each turbine rotor set is composed of a radial array of identical asymmetrical airfoil blades (similar to NASA GA(W)-1). The two rotor sets are assembled as back-to-back minor images. Both rotor sets are locked to a common axle by means of sprag-type freewheeling clutches. This configuration provides for smooth and continuous unidirectional movement of the axial drive line which drives the two generators.