The present invention solves the foregoing problems by providing a control system comprising a remote control module in wireless communication with a cable reel module connected to a motor operated cable reel. Advantageously, the remote control module comprises a first user interface for entering instructions and a processor for transmitting the instructions to the cable reel module to extend or retract the cable and thus control the ascent or descent of an ROV attached to the cable. Due to the processor-controlled nature of the control system automated operations of ROV ascent and descent can be realised. Furthermore, the cable reel module itself is provided with a second user interface that can enact a manual override and emergency stop of the ROV motion in the event that the remote control aspect malfunctions or is being operated incorrectly.