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Cable robots have been extensively used for the loading and unloading of cargo in shipping industries. In this paper, we look at a two-stage cable robot, i.e., a cable robot with two moving platforms connected in series. Sea conditions introduce disturbance into the system. This disturbance is considered while modeling the dynamics of the two-stage cable robot. A robust controller is designed which can assure robust tracking of the desired end-effector trajectory in the presence of the disturbance. The simulation results presented show the effectiveness of the controller.