DEEP SEA DIVER |
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Diving is still evolving, but general classifications have grown up to describe various diving activities. These classifications include but are not limited to:
Commercial diving
Military diving
Combat divers
Armed forces work divers
Recreational diving
Underwater Photography & Video
Spear fishing
Marine life counting and identification
Rescue & recovery diving
Scientific diving
Technical diving (also called Tech Divers)
Cave diving
Cavern diving
Deep diving
Ice diving
Wreck diving
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DREDGING / RECLAMATION |
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Dredging is miscellaneous excavator-type work underwater, usually in shallow sea or fresh water.
A dredge is a device for scraping or sucking the seabed, used for dredging.
A dredger is a ship or boat equipped with a dredge.
American usage sometimes calls the ship or boat a dredge.
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DROWNING |
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Drowning is death caused by the filling of the lungs by a liquid, usually water, rendering breathing ineffective and leading to death due to asphyxia. Near drowning is initial survival of a drowning event, and can lead to serious secondary complications including death later on; cases of near drowning therefore also require attention by medical professionals. Secondary drowning is death due to chemical and biological changes in the lungs after a near drowning incident or exposure to chemicals. In many countries, drowning is one of the leading causes of death for children under 14 years old.
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LASIK |
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LASIK, an acronym for Laser-assisted In Situ Keratomileusis, is a form of refractive laser eye surgery procedure performed by ophthalmologists intended for correcting vision. The procedure is usually a preferred alternative to photorefractive keratectomy, PRK, as it requires less time for full recovery, and the patient experiences less pain overall.
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PROFESSIONAL SCUBA DIVER |
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Diving is still evolving, but general classifications have grown up to describe various diving activities. These classifications include but are not limited to:
Commercial diving
Military diving
Combat divers
Armed forces work divers
Recreational diving
Underwater Photography & Video
Spear fishing
Marine life counting and identification
Rescue & recovery diving
Scientific diving
Technical diving (also called Tech Divers)
Cave diving
Cavern diving
Deep diving
Ice diving
Wreck diving
Scuba diving is swimming underwater while using self-contained breathing equipment.
Scuba divers exploring fish and coral.By carrying a source of compressed air, the scuba diver is able to stay underwater longer than with the simple breath-holding techniques used in Snorkeling and Free-diving, and is not hindered by air-lines to a remote air source. The scuba diver typically swims underwater by using fins attached to the feet. However, some divers also move around with the assistance of a DPV (Diver Propulsion Vehicle), commonly referred to as a "scooter", or by using surface-tethered devices called sleds, which are pulled by a boat.
The term SCUBA arose during World War II and originally referred to USA combat frogmen's oxygen rebreathers, developed by Dr. Christian Lambertsen for underwater warfare. Today, SCUBA typically usually refers to the in-line open-circuit equipment, developed by Emile Gagnan and Jacques-Yves Cousteau, in which compressed gas (usually air) is inhaled from a tank and then exhaled into the water. However, rebreathers (both semi-closed circuit and closed circuit) are also self-contained systems (as opposed to surface-supplied systems) and are therefore classified as SCUBA.
Although the word 'SCUBA' is an acronym for "Self Contained Underwater Breathing Apparatus", it has also become acceptable to refer to SCUBA as 'scuba equipment' or 'scuba apparatus'.
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SCUBA |
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SCUBA is an acronym for Self-Contained Underwater Breathing Apparatus. These initials originated in 1939 in the US Navy to refer to US military diver's rebreather sets. As with radar, the acronym has become so familiar that it is often not capitalised and is treated as an ordinary word: for example, it has been taken into the Welsh language as "sgwba". A scuba set provides a scuba diver with the breathing gas necessary to breathe underwater.
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