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Narcosis while deep diving is prevented by breathing a gas mixture containing helium. Helium is stored in brown cylinders. The most straightforward way to avoid nitrogen narcosis is for a diver to limit the depth of dives. Since narcosis becomes more severe as depth increases, a diver keeping to shallower depths can avoid serious narcosis.
Manufacturers are continuously improving diving equipment to allow deeper, longer and safer diving operations, but the equipment still has ergonomic limitations and can exert significant stress on the diver: [1] Regulators require increased breathing effort. Protective suits restrict mobility.
In deeper diving, the scrubber needs to be bigger than is needed for a shallow-water or industrial oxygen rebreather, to provide longer dwell time, because of this effect. At low temperatures the scrubber reaction will be slower, and may not remove enough carbon dioxide if the dwell time is too short.
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 .
The diving work associated with the recovery of all or part of ships, their cargoes, aircraft, and other vehicles and structures which have sunk or fallen into water is called salvage diving. In the case of ships it may also refer to diving to do repair work to make an abandoned or distressed but still floating vessel more suitable for towing ...
Appropriately skilled and fit freedivers can go as deep, or deeper than, recreational scuba divers, the depth being limited only by the willingness to accept the risks; scuba diving is restricted by the level of certification. Freshwater springs, often with excellent visibility, provide good freediving opportunities but with greater risks.
The science of underwater diving includes those concepts which are useful for understanding the underwater environment in which diving takes place, and its influence on the diver. It includes aspects of physics, physiology and oceanography. The practice of scientific work while diving is known as Scientific diving.