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The hand signal "OK" Diver communications are the methods used by divers to communicate with each other or with surface members of the dive team. In professional diving, diver communication is usually between a single working diver and the diving supervisor at the surface control point.
The procedures vary depending on whether the diver is using scuba or surface supplied equipment. Scuba divers control their own descent and ascent rate, while surface supplied divers may control their own ascents and descents, or be lowered and lifted by the surface team, either by their umbilical, or on a diving stage, or in a diving bell.
The IDSA training standard comprises 5 modules, of which Module A is theory common to all modes of diving, Module B is commercial scuba, Module C is inshore air diving to 30 msw and associated underwater work, Module D is surface supplied offshore air diving to 50 msw using a wet bell and hot water suit, and Module E is closed bell mixed gas ...
These effects vary with wavelength of the light, and color and turbidity of the water. The human eye is unable to focus when in direct contact with water, and an air space must be provided. Voice communication requires special equipment, and much recreational diver communication is visual and based on hand signals.
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.
Professional divers mostly consider these backup signals if voice communications fail, but they can be helpful for recreational and particularly technical divers, who can use them on surface marker buoy lines to signal to the surface support crew. [34] Divers, including professionals, generally use hand signals when visibility allows ...
Clearing a flooded demand valve is both a routine procedure and an emergency procedure. It is an emergency procedure because if the DV is not cleared, the diver could aspirate water and choke, but it can easily happen, and will happen when a diver switches to a different gas supply delivered through a different DV, and there are two easy ways to deal with it, so it should not be a problem on a ...
Diver voice communication equipment does not work with a standard scuba demand valve mouthpiece, so scuba divers generally use hand signals are when visibility allows, and there are a range of commonly used signals, with some variations. [85] These signals are often also used by professional divers to communicate with other divers. [86]
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