Power generation systems may be achieved by a variety of system, processes, and techniques. In one implementation, a power generation system may include a tank adapted to hold a liquid and a drive section submersed in the tank. The drive section may include a continuous, collapsible pressure container and a rotatable assembly around which the pressure container is routed. The rotatable assembly may contain an axis mounted to the tank. The drive section may also include a series of panels guided around the rotatable assembly to encourage the pressure container to expand and collapse as it circulates around the rotatable assembly.