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At a basic level, it is typically calculated in metres using the formula: Charted Depth − Draft-/+ Height of Tide = UKC. [3] Ship masters and deck officers can obtain the depth of water from Electronic navigational charts. [2] More dynamic or advanced calculations include safety margins for manoeuvring effects and squat. [7]
Human physiology of underwater diving is the physiological influences of the underwater environment on the human diver, and adaptations to operating underwater, both during breath-hold dives and while breathing at ambient pressure from a suitable breathing gas supply.
Open-water diving implies that if a problem arises, the diver can directly ascend vertically to the atmosphere to breathe air. [114] Wall diving is done along a near vertical face. Blue-water diving is done in good visibility in mid-water where the bottom is out of sight of the diver and there may be no fixed visual reference. [115]
In the early years of the sport, finding suitable places to jump was an issue, and people started jumping from any high place – in Europe and the United States they started jumping from bridges, then diving head first into the water. This evolved into "fancy diving" in Europe, and, particularly in Germany and Sweden, as a gymnastic act. The ...
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 .
Narcosis results from breathing gases under elevated pressure, and may be classified by the principal gas involved. The noble gases, except helium and probably neon, [2] as well as nitrogen, oxygen and hydrogen cause a decrement in mental function, but their effect on psychomotor function (processes affecting the coordination of sensory or cognitive processes and motor activity) varies widely.
A simple record of depth and time for a dive is useful as a legal record of a diving operation, where this is required, and in the case of an accident during the dive, an accurately recorded dive profile can provide useful diagnostic information for treatment of the injured diver and for analysis of the circumstances leading to the accident and ...
Cliff diving is the leaping off a cliff edge, usually into a body of water, as a form of sport. It may be done as part of the sport of coastal exploration [ 1 ] or as a standalone activity. Particular variations on cliff jumping may specify the angle of entry into the water or the inclusion or exclusion of human-made platforms or other equipment.