A SCUBA user is someone who uses a Self-Contained Underwater Breathing Apparatus, commonly known as SCUBA. A SCUBA DIVER is someone who uses SCUBA gear to explore underwater environments. SCUBA divers are trained in the use of SCUBA equipment and safety procedures, and they often participate in recreational activities such as snorkeling, spearfishing, and underwater photography. SCUBA divers also work in a variety of professional fields, such as search and rescue, scientific research, and underwater construction.