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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   Modern underwater video lights are now relatively small, have run times of 45–60 minutes and output 600–8000 lumens. These LED lights are powered by Lithium-ion batteries and usually have a 5600 K (daylight) color temperature. [16]

3. Fishing light attractor - Wikipedia

   en.wikipedia.org/wiki/Fishing_light_attractor

   In this video, dozens of 15-18 inch speckled trout are attracted to a 1000 W green light mounted on a pier. A fishing light attractor is a fishing aid that uses lights attached to a structure above water or suspended underwater to attract fish and members of their food chain.

4. Drowning detection system - Wikipedia

   en.wikipedia.org/wiki/Drowning_detection_system

   Active systems are often using a wearable on the swimmer, such as a wristband, that monitors the behaviour and position of the swimmer. If the swimmer is detected to be under water för a certain period, an alarm is triggered and through acoustic underwater communication from the wristband to receivers installed in the pool the alarm is transferred to on-site lifeguards that immediately can ...

5. Night diving - Wikipedia

   en.wikipedia.org/wiki/Night_diving

   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]

6. San Francisco Bay - Wikipedia

   en.wikipedia.org/wiki/San_Francisco_Bay

   Large ships transiting the bay must follow deep underwater channels that are maintained by frequent dredging as the average depth of the bay is only as deep as a swimming pool—approximately 12 to 15 ft (4–5 m). Between Hayward and San Mateo to San Jose it is 12 to 36 in (30–90 cm). The deepest part of the bay is under and out of the ...

7. City Under the Sea - Wikipedia

   en.wikipedia.org/wiki/City_Under_the_Sea

   City Under the Sea (released as War-Gods of the Deep in the US) [1] is a 1965 British-American adventure horror science fiction film.It was directed by Jacques Tourneur (his final film) and starred Vincent Price, Tab Hunter, Susan Hart and David Tomlinson.