<P> underwater diving to a depth beyond the norm accepted by the associated community </P> <P> 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, and 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 . Nitrogen narcosis becomes a hazard below 30 metres (98 ft) and hypoxic breathing gas is required below 60 metres (200 ft) to lessen the risk of oxygen toxicity . Professional divers may use an atmospheric diving suit that allows very deep dives of up to 610 metres (2,000 ft). </P> <P> For some recreational diving agencies, Deep diving, or Deep diver may be a certification awarded to divers that have been trained to dive to a specified depth range, generally deeper than 30 metres (98 ft). However, the Professional Association of Diving Instructors (PADI) defines anything from 18 metres (60 ft) to 30 metres (100 ft) as a "deep dive" in the context of recreational diving (other diving organisations vary), and considers deep diving a form of technical diving . </P>

How deep can a person dive in the ocean
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