Abstract: An underwater turbine operated by prevailing ocean currents in which the generator casing has a large enough interior to house the generator and still provide space for an operator to enter the casing interior to inspect the generator and the electrical connections. The casing is swingably mounted on a base that rests on the ocean floor and a propeller for rotating the generator at a proper and constant speed is rotatably mounted at the forward end of the casing while a tail or fins extend from the rear of the casing for the purpose of keeping the propeller facing in the direction of the incoming water current regardless of the slight variations in the current flow. The casing is hermetically sealed and has an entrance hatch which, when opened, permits the operator to enter the casing interior.