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Tag Archive: limits


Technical versus Recreational Scuba Diving:  Why is there a need for Rules, Boundaries and Limitations? There is currently a strong debate about the need to differentiate between recreational and technical scuba diving. Some people believe that ‘diving is diving’ and question the need to draw a distinct boundary between recreational and technical diving pursuits. In […]

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Scuba Q and A: Why Do Deep Divers Use Helium? Q. Why is helium preferred over nitrogen for diluting oxygen during deep sea diving? Answer: There are three reasons why helium becomes a necessary addition to breathing gas as depth increases: Oxygen Toxicity Oxygen is known to cause central nervous system (CNS) toxicity at higher […]

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Scuba Q and A: How Deep Can You Dive Using Air? Q. How deep can someone scuba dive using normal air? Answer:  There are a number of factors that determine the Maximum Operating Depth (MOD) of any gas mixture. These include: Inert-Gas Narcosis Inert gas narcosis using air begins to become debilitating through anaesthetic effect […]

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Scuba Q and A Question:   I was taught that “recreational divers plan all dives to be no stop dives” and also that most agencies consider 40m /130 feet as the maximum depth for recreational deep diving.  That seems inconsistent when my dive computer allows me to dive below 40m/130 feet and still stay inside no-stop limits. […]