Submerged hydroelectric turbines having buoyancy chambers

In a hydroelectric turbine having a rotor disposed inside the stator housing, having an annular outer rim received by a channel in the stator housing the rotor and the improvements comprising a buoyant rotor, the rotor Preferably, a buoyancy chamber disposed therein. The buoyancy chambers may be disposed within the annular outer rim, the blades, the annular inner rim, or combinations thereof. Preferably, the buoyancy chamber is filled with a material having a specific gravity less than or equal to 1, and most preferably, the fill material is a polymer foam that adds rigidity to the rotor.Turbine (turbine), buoyant force (buoyancy), the chamber (chamber)