DIVING APPARATUS is a term used to refer to the equipment used by divers to explore underwater. The two most common pieces of diving apparatus are the AQUALUNG and SCUBA. The AQUALUNG is an open-circuit, self-contained underwater breathing apparatus that was invented in the 1940s. It consists of a tank of compressed air, a regulator, and a face mask. SCUBA stands for Self-Contained Underwater Breathing Apparatus and is a closed-circuit system that recycles the air breathed by the diver. It consists of a tank of compressed air, a regulator, and a full-body suit. Both the AQUALUNG and SCUBA allow divers to explore the depths of the ocean and discover its hidden wonders.