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Normal requirements for night diving are a dive light, and adequate protection from exposure. [1] Some precautions and skills for night diving include: avoiding shining the light in other divers' eyes, to be aware of and use surface light signals for bearings, and if appropriate to use an illuminated shotline buoy. [1]
A dive light is routinely used during night dives and cave dives, when there is little or no natural light, but also has a useful function during the day, as water absorbs the longer (red) wavelengths first then the yellow and green with increasing depth. By using artificial light, it is possible to view an object in full color at greater depths.
The diving spread is a commercial diving term for the topside dive site infrastructure supporting the diving operations for a diving project. The diving contractor provides the diving and support equipment and sets it up on site, usually at a place provided for the purpose by the client, or on a diving support vessel.
Un-kit (dressing out) – Removal of diving equipment worn and carried by the diver. Debriefing – Report back and review on a project or mission after completion. Log dive – Recording specific details about the dive in a diver's logbook (paper or electronic database). Clean, inspect and store equipment – Basic daily user maintenance.
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Black-water diving – Open ocean mid-water diving at night; Penetration diving, also known as overhead environments – Diving under a physical barrier to a direct vertical ascent to the surface Cave diving – Diving in water-filled caves; Cavern diving – Diving in the part of a cave where the exit is visible by natural light
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