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SUEX – Diver propulsion vehicles, underwater navigation systems. [133] Suunto – Finnish manufacturer of compasses, dive computers and sports watches – Dive computers, compasses; Swindell (diving helmet), also known as Advanced Diving Equipment Company – Free-flow open circuit air helmets. [134] The helmet was invented by George Swindell
Divers Alert Network (DAN) is a group of not-for-profit organizations dedicated to improving diving safety for all divers. It was founded in Durham, North Carolina, United States, in 1980 at Duke University providing 24/7 telephonic hot-line diving medical assistance.
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Open water is unrestricted water such as a sea, lake or flooded quarry, where the diver has unobstructed direct vertical access to the surface of the water in contact with the atmosphere. [6] Open-water diving implies that if a problem arises, the diver can directly ascend vertically to the atmosphere to breathe air. [7]
Communication is central to buddy and team diving. DIR divers must be competent at underwater communication by hand signals and light signals, and to use them to ensure that they are always aware of the status of the rest of the team. DIR divers have an extended range of hand signals, some particularly relevant to overhead and decompression diving.
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