The long wavelengths of the light spectrum—red, yellow, and orange—can penetrate to approximately 15, 30, and 50 meters (49, 98, and 164 feet), respectively, while the short wavelengths of the light spectrum—violet, blue and green—can penetrate further, to the lower limits of the euphotic zone. Blue penetrates the deepest, which is why deep, clear ocean water and some tropical water appear to be blue most of the time. Moreover, clearer waters have fewer particles to affect the transmission of light, and scattering by the water itself controls color. Water in shallow coastal areas tends to contain a greater amount of particles that scatter or absorb light wavelengths differently, which is why sea water close to shore may appear more green or brown in color.
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Video credit: Kendall Roberg
Fun fact! This is why there are some sea creatures in the twilight zone in the ocean who use red pigment to camoflauge. Red light doesn't reach down that far, so there isn't any light to reflect and the animals appear black.
This makes me realize that many of the brightly colored pictures of coral and brightly colored fish species have to be taken close to the surface.
the margin on this video is fucking insane