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For safety and efficiency, divers may need to communicate with others diving with them, or with their surface support team. The interface between air and water is an effective barrier to direct sound transmission, [9] and the natural water surface is also a barrier to visual communication across the interface due to internal reflection, particularly when not perfectly smooth.
Technical diver during a decompression stop. There is some professional disagreement as to what exactly technical diving encompasses. [10] [11] [12] It is an arbitrary distinction, and the line has been drawn in different places by different organisations, and has shifted on a few occasions.
Dive signal for out-of-air emergency. In emergencies when a diver runs out of air in the cylinder in current use, and when there is no buddy around to donate air, the use of a redundant air supply (such as independent twins or a pony bottle), allows a diver to perform an ascent in a controlled manner, breathing as normal. [8]
Communication is central to buddy and team diving. DIR divers must be competent at underwater communication by hand signals and light signals, and to use them to ensure that they are always aware of the status of the rest of the team. DIR divers have an extended range of hand signals, some particularly relevant to overhead and decompression diving.
RAID - Recreational, Professional, Technical, and Rebreather training www.diveraid.com SAA - The Sub-Aqua Association – British recreational diver training and certification organisation CMAS code GBR/F03 [2] [8] TDI - Technical Diving International – Technical diver training and certification agency EUF CB 2006002 [7] CMAS code INT/F05 [2] [8]
A system recommended by some organisations, mostly those involved in technical diving (GUE, [24] CMAS-ISA, other tech and cave diving groups) is to equip the regulator normally used throughout the dive (the "primary") with a long hose, typically 1.5 to 2 metres (5 to 7 ft) long, proportional to the height of the diver. This is the regulator ...
Technical diving includes methods that exceed the limits imposed on depth or immersion time for traditional recreational diving. It often involves the use of special gas mixtures (rather than compressed air) for breathing. NAUI standards for technical diving were developed by Tim O'Leary and published by NAUI Worldwide in 1997. [53]
Military diving is an occupation that has risks and responsibilities beyond those of other professional diving. Research and development in military diving equipment and procedures often eventually contributes to recreational and technical diving practice.