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Deep sea diving is underwater diving, usually with surface-supplied equipment, and often refers to the use of standard diving dress with the traditional copper helmet. Hard hat diving is any form of diving with a helmet, including the standard copper helmet, and other forms of free-flow and lightweight demand helmets.
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 .
Illustration of an occupied diving bell.. The diving bell is one of the earliest types of equipment for underwater work and exploration. [10] Its use was first described by Aristotle in the 4th century BC: "...they enable the divers to respire equally well by letting down a cauldron, for this does not fill with water, but retains the air, for it is forced straight down into the water."
1. Diving in special submersibles capable of withstanding the pressures of deeper parts of the ocean. The first dive of Otis Barton and William Beebe in their Bathysphere on June 11, 1930, to below 1400ft off Bermuda has been cited as the first deep-sea dive. [11] deep stops. See: Decompression theory#Thermodynamic model and deep stops
The Bathysphere on display at the National Geographic museum in 2009. The Bathysphere (from Ancient Greek βαθύς (bathús) 'deep' and σφαῖρα (sphaîra) 'sphere') was a unique spherical deep-sea submersible which was unpowered and lowered into the ocean on a cable, and was used to conduct a series of dives off the coast of Bermuda from 1930 to 1934.
On June 22, 2012, the Jiaolong submersible set a deep-diving record for state-owned vessels when the three-person sub descended 6,963 meters (22,844 ft) into the Pacific Ocean. [ 7 ] Among the most well-known and longest-in-operation submersibles is the deep-submergence research vessel DSV Alvin , which takes 3 people to depths of up to 4,500 ...
This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in other contexts. Underwater diving can be described as a human activity – intentional, purposive, conscious and subjectively meaningful sequence of ...
The common term for a place at which one may dive is a dive site (from "dive" and "site", meaning "the place, scene, or point of an occurrence or event". [64]) As a general rule, professional diving is done where the work needs to be done, and recreational diving is done where conditions are suitable.