What type of system is the FADS III?

The FADS III, or the Fleet Air Defense System III, operates as a surface-supplied diver life-support system, designed specifically for underwater operations. This type of system delivers breathing gas directly from the surface to the diver through a hose, ensuring a continuous supply while allowing for extended dive times without the limitations of traditional self-contained diving equipment. The FADS III also includes various features that enhance the diver's safety and communication capabilities while submerged, making it an essential tool for deep-sea operations and rescues.

In contrast, a portable diving suit is solely a personal protective garment that allows divers to work underwater but does not provide a breathing gas supply directly from the surface. An underwater communication device, while important in underwater operations, focuses on facilitating communication rather than meeting the life-support needs of the diver. A compressed air tank is a self-contained breathing apparatus, which differs from the surface-supplied approach of the FADS III. Thus, understanding the specific operational context of the FADS III clarifies why it is categorized as a surface-supplied diver life-support system.