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Water attenuates light by absorption, so use of a dive light will improve a diver's underwater vision at depth. [1] As the depth increases, more light is absorbed by the water. Color absorption depends on the purity of the water - pure water is most transparent to blue frequencies, but impurities may reduce this significantly.
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.
A backup light can be useful if the primary light fails, [9] and is essential if doing a decompression dive without a dive computer which can be read in the dark. There are several advantages to night diving at a site that is familiar from diving there during the day. The diver who is more familiar with the site is less likely to be disoriented ...
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 ...
The timeline of underwater diving technology is a chronological list of notable events in the history of the development of underwater diving equipment.With the partial exception of breath-hold diving, the development of underwater diving capacity, scope, and popularity, has been closely linked to available technology, and the physiological constraints of the underwater environment.
Cavern diving – Diving in the part of a cave where the exit is visible by natural light; Culvert – Structure to channel water past an obstacle; Ice diving – Underwater diving under ice; Intake – Opening or structure through which a fluid is admitted into a space or machine Penstock – Intake structure for turbines or sewerage systems
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