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A canister style dive light. Night diving is underwater diving done during the hours of darkness. It frequently refers specifically to recreational diving which takes place in darkness. The diver can experience a different underwater environment at night, because many marine animals are nocturnal. [1]
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.
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.
Ocean currents can flow strongly enough to make diving difficult. This is usually reasonably predictable. In some places the local topography can induce enough turbulence to be dangerous. River and inland water currents can be strong and dangerous in areas of high gradient.
Water clarity is a descriptive term for how deeply visible light penetrates through water. In addition to light penetration, the term water clarity is also often used to describe underwater visibility. Water clarity is one way that humans measure water quality, along with oxygen concentration and the presence or absence of pollutants and algal ...
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Dangers represented by Red Flags Rip currents: These powerful currents flow away from the shore, pulling swimmers out to deeper water. Even strong swimmers can struggle against them.
Oceanographers explored an area around the Pacific Ocean’s Nazca Ridge and found a massive underwater mountain. Using a sonar system, the researchers digitally mapped the seafloor of the area ...