Knowra Underwater diving Underwater diving Underwater diving is the practice of descending and moving beneath the water’s surface by breath-holding or using equipment that supplies breathing gas.
Scuba diving : Underwater diving in which a diver carries breathing gas in a self-contained apparatus. Scuba equipment lets divers remain submerged without a surface air supply.
Recreational diving : Nonprofessional underwater diving undertaken primarily for leisure and exploration. It is the common setting for guided and independently planned dives.
Breathing gas : A gas mixture suitable for inhalation under specified environmental and pressure conditions. Its composition and delivery determine what a diver can safely breathe at depth.
Snorkeling : Surface swimming with the face submerged while breathing through a snorkel. Unlike diving below the surface, snorkeling normally keeps the airway connected to surface air.
Freediving : Underwater diving on a single breath, without breathing gas supplied during the dive. Breath-hold diving is the equipment-free alternative within underwater diving.
Scientific diving : Underwater diving conducted to support research, observation, or data collection. Divers directly observe and sample aquatic environments that are difficult to study from the surface.
Diving cylinder : A pressure vessel used to store compressed breathing gas for underwater diving. It carries the gas supply used by scuba equipment.
Surface-supplied diving : Underwater diving in which breathing gas is delivered from the surface through a hose. It differs from scuba, where the diver carries the gas supply.
Buoyancy control : The adjustment of forces that determine whether a diver sinks, floats, or remains at a chosen depth. Precise buoyancy lets divers change depth and move without constant effort.
Commercial diving : Professional underwater work performed for industrial, construction, inspection, or maintenance purposes. Commercial divers use specialized procedures for work on submerged structures.
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