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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MINING (ORES, PROCESSING) |
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Mining is the extraction of valuable minerals or other geological materials from the earth, usually (but not always) from an ore body, vein, or (coal) seam. Materials recovered by mining include bauxite, coal, diamonds, iron, precious metals, lead, limestone, nickel, phosphate, rock salt, tin,uranium, and molybdenum. Any material that cannot be grown from agricultural processes must be mined. Mining in a wider sense can also include extraction of petroleum, natural gas, and even water.
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PAINT |
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Paint is the general term for a family of products used to protect and add color to an object or surface by covering it with a pigmented coating. As a verb, painting is the application of paint. One who paints is called a painter.
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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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