Tethers supply the vital link from the ROV to the surface or control module. Either directly or via the tether management system (TMS) through the main lift umbilical.

Mechanical strength is normally incorporated into the design using aramid fibres by multi layer braids or centre strength cords of aramid fibres.

ROV tethers are a strategic component in the supporting performance of the cubicle, so the design & construction has to address, crucial factors such as small diameter, flexibility, ruggedness, buoyancy, depth & handling requirements.