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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.
The lower viewport and CTD probe Detail view of the dive weight release mechanism and one of the LED light panels The forward and downward view through the three ultra-wide angle acrylic viewports is unobstructed by structure or appendages, and illuminated by ten externally mounted high output LED lighting panels of 20,000 lumens each.
Deep wading or deep fording is a technique used by some heavy semi-amphibious vehicles to traverse water that is several metres deep - the vehicle drives on the riverbed/lakebed/seabed and uses screens or a pipe (a snorkel) that reaches above the water surface for an air supply.
Sudden loss of underwater visibility , which can cause disorientation and a diver getting lost under an overhead. Stirring up silt or other light loose material, either by natural water movement or by diver activity, often due to poor trim and finning skills. Appropriate trim, buoyancy and propulsion techniques.
Maritime transport (or ocean transport) or more generally waterborne transport, is the transport of people or goods via waterways. Freight transport by sea has been widely used throughout recorded history.
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.
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