The term “harness” in the context of a BCD (Buoyancy Control Device) refers to the system of straps and buckles that secure the BCD to a diver’s body. It includes shoulder straps, a waist strap, and sometimes additional chest or crotch straps. The harness is crucial for maintaining a secure and comfortable fit underwater, allowing divers to adjust the BCD for a snug fit. Proper adjustment of the harness ensures that the BCD stays in place during the dive, contributing to comfort, safety, and effective buoyancy control