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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   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.

3. Underwater vision - Wikipedia

   en.wikipedia.org/wiki/Underwater_vision

   Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water. They are also blurred by scattering of light between the object and ...

4. Deep diving - Wikipedia

   en.wikipedia.org/wiki/Deep_diving

   Deep diving is underwater diving to a depth beyond the norm accepted by the associated community. In some cases this is a prescribed limit established by an authority, while in others it is associated with a level of certification or training, and it may vary depending on whether the diving is recreational , technical or commercial .

5. Water clarity - Wikipedia

   en.wikipedia.org/wiki/Water_clarity

   Light attenuation can be measured as the decrease in downwelling light (Kd) or the decrease in scalar light (Ko) with depth. [29] [30] [31] Light attenuation is most useful as a measure of the total underwater light energy available to plants, such as phytoplankton and submerged aquatic vegetation.

6. Glossary of underwater diving terminology: H–O - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_underwater...

   Main article: Underwater habitat An underwater structure inside which divers can carry out dry welding or which is fitted out with life support facilities. Haldanean Haldanian See: Decompression theory#Critical ratio hypothesis Decompression models based on the principles described by John Scott Haldane. half+200 half+15 See: Half + 15 bar An alternative scuba reserve gas management strategy ...

7. Doing It Right (scuba diving) - Wikipedia

   en.wikipedia.org/wiki/Doing_It_Right_(scuba_diving)

   However even in good visibility a powerful light can enhance the dive by restoring full colour at depth. The canister is carried on the waist belt to the right side, secured by a belt buckle, and the light head is carried on the left hand when in use, and clipped to the right shoulder D-ring when not in use or when the hands are needed to ...