The connecting hose to a tethered submersible unit and from this unit to the divers. It may contain life support, surveillance, communication, remote control and power supply cables, (ABS).
The most common form of an umbilical contains electric cables for transmitting power and signals and high, medium- or low-pressure tubes for carrying hydraulic liquids and chemicals. In the manufacture, one element is placed at the core of the umbilical – it may be a power cable, a tube, or a bundle of tubes. The other elements are then arranged around the core, if necessary in more than one layer. Fillers are placed between the elements to provide a stable construction, and a plastic sheath may be applied as an outer layer.