Unlike other modes of diving, which rely either on breath-hold or on breathing gas pumped from the surface, scuba diving offers a significant advantage by allowing divers to carry their own source of breathing gas, typically in the form of compressed air stored in tanks. This provides divers with a far greater range of movement and flexibility underwater than methods that involve an air line or a diver’s umbilical, which connect the diver to the surface. Additionally, the use of scuba equipment allows for much longer underwater endurance compared to breath-hold diving, where the diver’s ability to stay submerged is limited by their oxygen capacity.

Scuba equipment can come in different configurations, with one of the most common being open-circuit systems, where exhaled gas is expelled into the water, making it distinct from other closed-circuit or semi-closed-circuit systems where the gas is reused to some extent. This versatility and independence make scuba diving a popular choice for both recreational and professional divers, offering more freedom and convenience in various underwater environments.