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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. 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 ...

4. Outline of underwater diving - Wikipedia

   en.wikipedia.org/wiki/Outline_of_underwater_diving

   Underwater diving can be described as all of the following: A human activity – intentional, purposive, conscious and subjectively meaningful sequence of actions. . Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to the order of a day at a ...

5. Diving activities - Wikipedia

   en.wikipedia.org/wiki/Diving_activities

   Underwater football is a two-team underwater sport is played in a swimming pool with snorkeling equipment: (mask, snorkel, and fins). The goal of the game is to manoeuvre (by carrying and passing ) a slightly negatively buoyant ball from one side of a pool to the other by players who are completely submerged.

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7. Diver navigation - Wikipedia

   en.wikipedia.org/wiki/Diver_navigation

   Nav finder and underwater compass – basic underwater navigation tools Suunto SK-7 diving compass in aftermarket wrist mount with bungee straps. Diver navigation, termed "underwater navigation" by scuba divers, [1] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.