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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   Beam angle may be as tight as 8 to 10 degrees in extreme cases, or as wide as around 140° with a plain flat glass port. Even wider angles are possible (exceeding 180°) with a domed port on the light, or a "test tube" light without reflector. LED lights usually use an internal "lens" to produce a focused beam.

3. Ocean optics - Wikipedia

   en.wikipedia.org/wiki/Ocean_optics

   Ocean optics is the study of how light interacts with water and the materials in water. Although research often focuses on the sea, the field broadly includes rivers, lakes, inland waters, coastal waters, and large ocean basins. How light acts in water is critical to how ecosystems function underwater.

4. Baited remote underwater video - Wikipedia

   en.wikipedia.org/wiki/Baited_remote_underwater_video

   Baited remote underwater video (BRUV) is a system used in marine biology research. By attracting fish into the field of view of a remotely controlled camera, the technique records fish diversity , abundance and behaviour of species.

5. Remotely operated underwater vehicle - Wikipedia

   en.wikipedia.org/wiki/Remotely_operated...

   ROV at work in an underwater oil and gas field. The ROV is using a torque wrench to adjust a valve on a subsea structure.. A remotely operated underwater vehicle (ROUV) [citation needed] or remotely operated vehicle (ROV) is a free-swimming submersible craft used to perform underwater observation, inspection and physical tasks such as valve operations, hydraulic functions and other general ...

6. Texas wants to buy surplus border wall parts but U.S ... - AOL

   www.aol.com/texas-wants-buy-surplus-border...

   Texas Lt. Gov. Dan Patrick said U.S.-owned border wall materials, which were available for sale, were pulled from an Arizona auction at the government's request. ... That led to the eventual sale ...

7. Semi-submersible naval vessel - Wikipedia

   en.wikipedia.org/wiki/Semi-submersible_naval_vessel

   The 1960s Soviet Project 1231 was a concept for a missile boat that would travel with hydrofoils on the surface and then dive to avoid observation, which was never built. [ 16 ] The 2010 French SMX-25 was a submarine design concept by defence company, DCNS , with surface ship characteristics, which would allow high surface speed for more rapid ...