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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   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.

3. Magnesium torch - Wikipedia

   en.wikipedia.org/wiki/Magnesium_torch

   A magnesium torch is a bright light source made from magnesium, which can burn underwater and in all weather conditions. They are used for emergency illumination for railroad applications. They were also used in the 1950s up to the early 1970s as a light source for scuba diving, and were featured occasionally in television shows. A relay of ...

4. Depth gauge - Wikipedia

   en.wikipedia.org/wiki/Depth_gauge

   It is a piece of diving equipment used by underwater divers, submarines and submersibles. Most modern diving depth gauges have an electronic mechanism and digital display. Earlier types used a mechanical mechanism and analogue display. Digital depth gauges used by divers commonly also include a timer showing the interval of time that the diver ...

5. Timeline of diving technology - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_diving_technology

   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.

6. Diving equipment - Wikipedia

   en.wikipedia.org/wiki/Diving_equipment

   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 ...

7. Night diving - Wikipedia

   en.wikipedia.org/wiki/Night_diving

   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 ...