Diving is the sport of jumping or falling into water from a platform or springboard, usually while performing acrobatics. Diving is an internationally recognized sport that is part of the Olympic Games. In addition, unstructured and non-competitive diving is a recreational pastime.
Trimix is a breathing gas consisting of oxygen, helium and nitrogen and is used in deep commercial diving, during the deep phase of dives carried out using technical diving techniques, and in advanced recreational diving.
Deep diving is underwater diving to a depth beyond the norm accepted by the associated community. In some cases this is a prescribed limit established by an authority, while in others it is associated with a level of certification or training, and it may vary depending on whether the diving is recreational, technical or commercial. Nitrogen narcosis becomes a hazard below 30 metres (98 ft) and hypoxic breathing gas is required below 60 metres (200 ft) to lessen the risk of oxygen toxicity.
Altitude diving is underwater diving using scuba or surface supplied diving equipment where the surface is 300 metres (980 ft) or more above sea level. Altitude is significant in diving because it affects the decompression requirement for a dive, so that the stop depths and decompression times used for dives at altitude are different from those used for the same dive profile at sea level. The U.S. Navy tables recommend that no alteration be made for dives at altitudes lower than 91 metres (299 ft) and for dives between 91 and 300 meters correction is required for dives deeper than 44 metres (144 ft) of sea water. Most recently manufactured decompression computers can automatically compensate for altitude.
Sheck Exley was an American cave diver. He is widely regarded as one of the pioneers of cave diving, and he wrote two major books on the subject: Basic Cave Diving: A Blueprint for Survival and Caverns Measureless to Man. On February 6, 1974, Exley became the first chairman of the Cave Diving Section of the American National Speleological Society. During his career, he established many of the basic safety procedures used in cave and overhead diving today. Exley was also a pioneer of extreme deep scuba diving.
The British Aerospace Jetstream 41 is a turboprop-powered feederliner and regional airliner, designed by British Aerospace as a stretched version of the popular Jetstream 31. Intended to compete directly with 30-seat aircraft like the Embraer Brasilia, Dornier 328 and Saab 340, the new design eventually accommodated 29 passengers in a two-by-one arrangement like the Jetstream 31. Eastern Airways of the UK is the biggest operator of Jetstream 41s in the world, with 14 in the fleet.
An atmospheric diving suit (ADS) is a small one-person articulated submersible which resembles a suit of armour, with elaborate pressure joints to allow articulation while maintaining an internal pressure of one atmosphere. An ADS can enable diving at depths of up to 2,300 feet (700 m) for many hours by eliminating the majority of significant physiological dangers associated with deep diving. The occupant of an ADS does not need to decompress, and there is no need for special breathing gas mixtures, so there is little danger of decompression sickness or nitrogen narcosis when the ADS is functioning properly. An ADS can permit less skilled swimmers to complete deep dives, albeit at the expense of dexterity.
Boesmansgat, also known in English as "Bushman's Hole", is a deep submerged freshwater cave in the Northern Cape province of South Africa, which has been dived to a depth of 282.6 metres (927 ft).
Herbert Nitsch is an Austrian freediver who has held world records in all of the eight freediving disciplines recognised by AIDA International. He is the current freediving world record champion and "the deepest man on earth". This title was given to him when he set a world record in the "No Limit" discipline at the depth of 214 meters. To date, he has achieved 33 official World Records across all freediving disciplines, and one world record in the traditional Greek discipline of Skandalopetra 107 m (351 ft). He surpassed his own No Limit depth with a dive in June 2012 to 253.2 meters, suffering injury in the process.
High diving is the act of diving into water from relatively great heights. High diving can be performed as an adventure sport, as a performance stunt, or competitively during sporting events.
David John Shaw was an Australian scuba diver, technical diver, and airline pilot for Cathay Pacific, flying the Lockheed L-1011 Tristar, then the 747-400, and then the A330-300, A340-300, and A340-600. He flew for Cathay Pacific from 1989 until his death in 2005. Before flying for Cathay Pacific, he flew for Mission Aviation Fellowship in Papua New Guinea and Tanzania. He also flew agricultural aircraft in South Australia and New South Wales.
Guo Jingjing is a retired Chinese diver, and multi-time Olympic gold medalist and world champion. Guo is tied with her partner Wu Minxia for winning the most Olympic medals (6) of any female diver and she won the 3m springboard event at five consecutive World Championships. She announced her retirement in 2011.
Persier was a 5,382 GRT cargo ship which was built in 1918 as War Buffalo for the British Shipping Controller. In 1919, she was sold to Belgium and renamed Persier. Between 1934 and 1941 she also held a passenger certificate. She was driven ashore on the Icelandic coast in a storm in February 1941 which put her out of action for two years. Returned to service in February 1943, she served until 11 February 1945, when she was torpedoed and sunk by U-1017 with the loss of 20 crew.
Deon Dreyer was a South African recreational scuba diver who died in Bushman's Hole in South Africa. Cave diver David Shaw died more than 10 years later while attempting to retrieve Dreyer's body.
Deborah Andollo Lopez, also known as Deborah Andollo, is a Cuban free-diving athlete who held several world records in different disciplines. In 1996, she set a free-diving record of about 357 feet. On the "AIDA website’s world record history in both constant weight and No-Limits. In 1996 she excelled in constant 61 metres (200 ft) and no-limits 110 metres (360 ft), and did 100 metres (330 ft) in variable weight in Italy.
HMS Thracian was an S-class destroyer built for the Royal Navy during the First World War.
The plunge for distance is a diving event that enjoyed its greatest popularity in the 19th and early part of the 20th century, even being included as an official event in the 1904 Summer Olympics. By the 1920s, it began to lose its popularity and slowly disappeared from U.S. and English swim competitions.
Guy "Rusty" Garman, sometimes known as Doc Deep, was a physician and scuba diver who died during an attempt to set a world record recreational deep dive on 15 August 2015, aged 56.
The history of underwater diving starts with freediving as a widespread means of hunting and gathering, both for food and other valuable resources such as pearls and coral. By classical Greek and Roman times commercial applications such as sponge diving and marine salvage were established. Military diving also has a long history, going back at least as far as the Peloponnesian War, with recreational and sporting applications being a recent development. Technological development in ambient pressure diving started with stone weights (skandalopetra) for fast descent. In the 16th and 17th centuries diving bells became functionally useful when a renewable supply of air could be provided to the diver at depth, and progressed to surface-supplied diving helmets—in effect miniature diving bells covering the diver's head and supplied with compressed air by manually operated pumps—which were improved by attaching a waterproof suit to the helmet and in the early 19th century became the standard diving dress.
Edmund Caunce Nowell 'Ted' Heaton was a British diver and swimming instructor born in Liverpool, England. He is notable for his small tank diving displays during the late 19th century and for his several unsuccessful attempts to swim the English Channel during the early 20th century. Having begun training to swim the channel in 1893, he made a total of seven attempts. He often came within several miles of the French coast, with the closest being in August 1909 when he came within 2 miles (3.2 km). His swimming efforts earned him a role as a superintendent of his local swimming baths and a salary of £120 a year which also included accommodation and energy provision.
