Human: I'm interested in learning about the different kinds of scuba diving equipment. Assistant: 
Scuba diving is a popular recreational activity that involves underwater exploration using self-contained breathing apparatus, commonly referred to as scuba gear. There are two main types of scuba gear: open circuit and closed circuit. Open circuit scuba systems use compressed air from a tank carried by the diver and exhaled into the water, while closed circuit systems use a high pressure oxygen supply from an external source such as a surface supplied or rebreather system. The choice between these depends on the type of dive being undertaken and personal preference. Other important pieces of scuba gear include masks, fins, snorkels, regulator valves, buoyancy control devices, dive computers, and wetsuits.