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Underwater refers to the region below the surface of water where the water exists in a natural feature such as an ocean, sea, lake, pond, or river.

With increasing depth underwater, sunlight is absorbed, and the amount of visible light diminishes. Because absorption is greater for long wavelengths than for short wavelengths , the colour spectrum is rapidly altered with increasing depth. White objects at the surface appear bluish underwater, and red objects appear dark, even black. Although light penetration will be less if water is turbid, in the very clear water of the open ocean less than 25% of the surface light reaches a depth of 10 m . At 100 m the light present from the sun is normally about 0.5% of that at the surface. (source : wikipedia)

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