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2. Fishing light attractor - Wikipedia

   en.wikipedia.org/wiki/Fishing_light_attractor

   Fish are most attracted to true-green light colors, and LEDs do the best job of illuminating this color. A fishing light attractor is a fishing aid that uses lights attached to structures above water or suspended underwater to attract fish and members of their food chain. Fish are typically most attracted to true-green light colors.

3. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   A few underwater lights have a focusing facility by which the beam angle can be adjusted. There are two ways this can be done, depending on the basic emission pattern of the light source. HID lights, which generally produce non-directional light, are usually focused by a reflector, which can be slid longitudinally over the light.

4. Submarine navigation - Wikipedia

   en.wikipedia.org/wiki/Submarine_navigation

   Submarine navigation underwater requires special skills and technologies not needed by surface ships. The challenges of underwater navigation have become more important as submarines spend more time underwater, travelling greater distances and at higher speed. Military submarines travel underwater in an environment of total darkness with ...

5. Day shapes - Wikipedia

   en.wikipedia.org/wiki/Day_shapes

   The appropriate lights may also be displayed during the day at times of restricted visibility or other necessary circumstances. [3] Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night. [4] A square black flag displayed over the ball may be used as a distress signal. [5]

6. Fishing techniques - Wikipedia

   en.wikipedia.org/wiki/Fishing_techniques

   Fishing light attractors - use lights attached (above or underwater) to some structure to attract fish and bait fish. Fishing light attractor are operated every night. After a while, fish discover the increased concentration of bait surrounding the light. Once located, the fish return regularly, and can be harvested.

7. Dock - Wikipedia

   en.wikipedia.org/wiki/Dock

   A drydock is another variant, also with dock gates, which can be emptied of water to allow investigation and maintenance of the underwater parts of ships. A floating dry dock (sometimes just floating dock) is a submersible structure which lifts ships out of the water to allow dry docking where no land-based facilities are available.