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A buoyancy-enhanced loop drive system includes upper and lower gears, a helical drive loop extending around and rotatably engaging the upper and lower gears, and a tank configured to retain a liquid medium. An ascending side of the drive loop extends through the tank. In some embodiments, the drive loop includes a plurality of sections, and adjacent sections are rotatable with respect to each other about an axis normal to an end face of the sections. Additionally or alternatively, the ascending side of the drive loop advances through an inlet seal via an exit port defined in an exit wall oriented perpendicular to the exit direction. Additionally or alternatively, an intermediate plate is coupled to an inlet housing for rotation about a vertical axis, and to a stationary support structure for bi-directional translation.

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