What is the purpose of an umbilical in diving?

The umbilical in diving serves as a vital connection between divers and the surface, providing essential elements such as air supply and communication links. This connection ensures that divers can breathe while submerged and remain in constant communication with surface personnel, which is crucial for safety and operational efficiency during diving operations. The umbilical typically contains high-pressure hoses for breathing gas, communication cables, and may also incorporate systems for monitoring diver safety, making it an indispensable tool in underwater environments.

Other options, while they may relate to various aspects of diving equipment or operations, do not accurately describe the primary function of the umbilical. Lighting, equipment support, or measuring instruments are handled by separate devices designed specifically for those purposes.