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Backup lights are carried in case the primary light fails during the dive. This is particularly important in cave and wreck penetration diving, where the light is required to facilitate navigation out of the enclosed space. Cave divers are trained to carry three dive lights as a result of an accident analysis by Sheck Exley published in 1977 ...
Apeks – British manufacturer of scuba diving equipment – Scuba regulators, buoyancy compensators, harnesses, masks, fins, lights, diving suits and accessories. [6] Acquired by AquaLung in 1997. [7] Apollo (dive gear) Scuba masks, fins, diver propulsion vehicles, dive lights. [8] Apple – American multinational technology company – Dive ...
A dive light can provide light if the visibility is sufficient. In zero visibility special precautions must be taken. It is usually preferable to use surface-supplied equipment with voice communications, as the diver can not get lost, and the surface team can monitor depth, time, breathing gas and decompression obligations.
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.
Underwater writing slates and pencils are used to transport pre-dive plans underwater, to record facts while underwater and to aid communication with other divers. Dive lights , which are usually waterproof and pressure rated torches or flashlights , are essential for safety in low visibility or dark environments such as night diving and wreck ...
Wall diving is done along a near vertical face. Blue-water diving is done in good visibility in mid-water where the bottom is out of sight of the diver and there may be no fixed visual reference. [121] Black-water diving is mid-water diving at night, particularly on a moonless night. [122] [123]
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