to the bell panel inside, for distribution to the interior of the bell and to the divers via the diver's umbilicals. The bell gas panel is operated by the bellman. A closed-bell handling system includes a bell umbilical handling system, which deploys, recovers and stores the umbilical. ROV Most ROVs are linked to a host ship by a neutrally buoyant tether or a load-carrying umbilical cable is used along with a tether management system (TMS). The TMS is either a garage-like device which contains the ROV during lowering through the splash zone or, on larger work-class ROVs, a separate assembly mounted on top of the ROV. The purpose of the TMS is to lengthen and shorten the tether so the effect of cable drag where there are underwater currents is minimized. The umbilical cable is an armored cable that contains a group of electrical conductors and fiber optics that carry electric power, video, and data signals between the operator and the TMS. Where used, the TMS relays the signals and power for the ROV down the tether cable. Once at the ROV, the power is distributed between the electrical components. See also References Cables Diving equipment