The deep blue color of the ocean has always captivated man, and divers marvel at the different shades of it every time they venture below the surface. But what is blue, exactly?

According to Wikipedia, Blue is the color of light between violet and green on the visible spectrum.

Hues of blue include indigo and ultramarine, closer to violet; pure blue, without any mixture of other colors; Cyan, which is midway on the spectrum between blue and green, and the other blue-greens: turquoise, teal, and aquamarine.

Depth decides the color

What shade of blue you see under water depends on many things. Most important is, of course, the depth – the further from the surface, the deeper blue the color.

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