Which subsystem of the Total Diving System best describes SCUBA?

SCUBA, which stands for Self-Contained Underwater Breathing Apparatus, is best described as a delivery system because it provides divers with the essential equipment needed to breathe underwater. The delivery system includes the cylinder that holds compressed air and the regulators that control the airflow, allowing divers to inhale and exhale comfortably beneath the surface.

This focus on delivering breathable air directly to the diver is pivotal to the essence of SCUBA, as it enables the diver to explore underwater environments safely and effectively. Other systems, such as the buoyancy system, would pertain to the equipment that helps control descent and ascent in the water column, while an information system might relate to devices like dive tables or computers that provide crucial diving data. The snorkeling system, on the other hand, is designed primarily for surface breathing and does not involve the same complexities and capabilities as SCUBA. Thus, recognizing SCUBA as primarily a delivery system emphasizes its role in providing the necessary air supply for underwater breathing.