Quote:
Originally Posted by Capt Jack Harkness
Lol, the opening sequence of Das Boot is a model in a tank... They never had a real boat for any of the shots.
Anyhow, I suspect this will be another debate without conclusion... Blue! Green! Blue! Green! 
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Yes, usually the green colour comes from algaes and other sea life while clean deep water is dark blue. but also it depends of the sea life , currents, and depth.
With increasing depth underwater, sunlight is absorbed, and the amount of visible light diminishes. Because absorption is greater for long wavelengths (red end of the visible spectrum ) than for short wavelengths (blue end of the visible spectrum), the colour spectrum is rapidly altered with increasing depth and gives a bluish cast.
ps. what control the underwater colour in the game ? can be changed easily editing files ?