Portal:Underwater diving

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Underwater diving

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Underwater diving is the practice of going underwater, either with breathing apparatus (scuba diving and surface supplied diving) or by breath-holding.

Recreational diving is a popular activity (also called sports diving or subaquatics), and includes technical diving, recreational scuba diving, freediving, snuba, snorkeling and a range of competitive sports performed underwater.

Professional diving includes diving as part of one's occupation, and takes a range of diving activities to the underwater work site. Commercial diving, military diving, public safety diving and scientific diving are aspects of professional diving.

Freediving is a form of underwater diving that does not involve the use external breathing devices, but relies on a diver's ability to hold his or her breath until resurfacing. Activities include breath-hold spear fishing, freedive photography, apnea competitions, and to some degree, snorkeling.

The scope of this portal includes the technology supporting diving activities, the physiological and medical aspects of diving, the procedures of diving, underwater activities which are to some degree dependent on diving, economical and commercial aspects of diving, biographical information on notable divers, inventors and manufacturers of diving related equipment and researchers into aspects of diving,

Selected article

Standard circular search pattern

Underwater searches are procedures carried out by divers in order to find a known or suspected target object or objects in a specified search area under water. There are a number of techniques in general use by Commercial, Scientific, Public service, Military, and Recreational divers. Some of these are suitable for Scuba, and some for surface supplied diving. The choice of search technique will depend on logistical factors, terrain, protocol and diver skills.

As a general principle, a search method attempts to provide 100% coverage of the search area. this is greatly influenced by the width of the sweep. In conditions of zero visibility this is as far as the diver can feel with his hands while proceeding along the pattern. When visibility is better, it depends on the distance at which the target can be seen from the pattern. In all cases then, the pattern should be accurate and completely cover the search area without excessive redundancy or missed areas. Overlap is needed to compensate for inaccuracy.

Selected biography

Sheck Exley (April 1, 1949 – April 6, 1994) was a cave-diving pioneer.

Exley is widely regarded as one of the pioneers of cave diving, writing two major books on the subject: Basic Cave Diving: A Blueprint for Survival and Caverns Measureless to Man published by Cave Books, (ISBN 0-939748-25-8), and establishing many of the basic safety procedures used in cave and overhead diving. Exley was also a pioneer of extreme deep water diving. In the book, Diving into Darkness (a story about Dave Shaw and Don Shirley) it was commented: "Exley's status in the sport is almost impossible to overstate."

Exley began diving in 1965 at the age of 16. That very year he entered his first cave and was hooked on cave diving for the remaining 29 years of his life.

He was the first in the world to log over 1,000 cave dives (at the age of 23): in over 29 years of cave diving, he made over 4,000. He is one of the few divers to survive a 122 meter (400 ft) dive on compressed air. During his diving career, he set numerous depth and cave penetration records.

Selected picture

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Engine order telegraph on the Kansho Maru - sunk during World War II. Federated States of Micronesia, Chuuk

Categories

Underwater diving(32 C, 29 P)
Underwater divers(9 C, 21 P)
Underwater archaeology(4 C, 25 P)
Armed forces diving(1 C, 53 P)
Diving engineering(35 P)
Diving organizations(2 C, 48 P)
Underwater diving environment(1 C, 3 P)
Diving equipment(17 C, 22 P, 2 F)
Underwater fiction(5 C, 2 P)
Free-diving(1 C, 31 P)
Underwater diving history(1 C, 7 P)
Manned submersibles(7 P)
Marine biology(7 C, 127 P, 1 F)
Marine salvage(1 C, 14 P)
Diving medicine(1 C, 58 P)
Underwater diving physiology(1 C, 9 P)
Underwater diving procedures(7 C, 35 P)
Professional diving(1 C, 4 P)
Recreational diving(2 C, 12 P)
Underwater diving safety(3 C, 31 P)
Scientific diving(2 C, 3 P)
Underwater security(1 C, 4 P)
Shipwreck law(1 C, 11 P)
Underwater diving sites(7 C, 16 P)
Sponge diving(1 C, 11 P)
Underwater diver training(1 C, 3 P)
Underwater diving stubs(141 P)

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