The meaning of term deep diving depends on the level of the diver's diver training, diving equipment, breathing gas and surface support: Safe diving requires training. ... The fundamental item of diving equipment used by divers is the SCUBA equipment, such as the Aqualung or Rebreather. ... Air is the most common and only natural breathing gas. ...
There are particular problems associated with deep dives: Recreational diving is a type of diving that uses SCUBA equipment for the purpose of leisure and enjoyment. ... Technical diving is a form of SCUBA diving that exceeds the scope of recreational diving. ... Surface supplied diver at the Monterey Bay Aquarium, Monterey, California Surface supplied diving refers to divers using equipment supplied with breathing gas using an umbilical cord from the surface, often from a diving support vessel but possibly, indirectly via a diving bell. ...
nitrogen narcosis is related to pressure. This causes stress and inefficient thinking in the diver. When breathing air many divers find 40 metres a safe maximum depth.
the need to do decompression stops increases with depth. A diver at 6 metres may be able to dive for several hours without needing to do decompression stops. At depths greater than 40 metres, diver may have only a few minutes before decompression stops are needed. In the event of an emergency the diver cannot make an immediate ascent to the surface without risking decompression sickness. The diver needs a disciplined approach to planning and conducting dives and needs to carry extra gas for the decompression stops.
gas consumption is proportional to pressure - so at 50 metres (6 bar) a diver breathes 6 times as much as on the surface (1 bar). Heavy physical exertion consumes even more gas. The diver needs to carry extra gas for deep dives.
gas becomes denser and the effort required to breath increases with depth.
Deepdiving demands vast amounts of knowledge, experience and discipline, as well as appropriate preparation and equipment, since deepdiving is fraught with potential hazards.
Some divers routinely dive to depths in excess of 165 feet/50 meters on air, although over recent years gas mixtures such as heliox and trimix have become far more commonly used for very deepdiving as they are less narcotic.
The depth of the onset of the effects of the exotic cocktail of elevated pressures of nitrogen, carbon dioxide and oxygen, coupled with the sensory deprivation and stress associated with diving, are not always predictable.
All groups, whether diving from a boat or from shore, are required to fly a diver down flag (a red flag with a white diagonal slash) to alert boaters that people are underwater.
Diving equipment depends on the location of the dive, but whether scuba diving or snorkeling, recreational divers need several basic items: a mask, a snorkel, fins, and, when necessary, an exposure suit to remain warm.
Emergency equipment includes a dive knife, in case the diver becomes entangled in fishing line or marine plants, and whistles, lights, or signaling devices, in case the diver is lost or swept out in a current.
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