 In the sky colour map editor, click on the small button under the right end of the gradient, so that the darker shade is in the current colour box. Now right click in the current colour box, and select Edit Colour to get the colour picker.
 Take the black square cursor a little way towards green, so that the shade in the colour box goes a more greenish blue. OK your way out of the atmosphere editor, and your water surface will become a more convincing shade for an undersea scene. We shall return to the atmosphere editor later to add fog and haze, but first we must deal with the sea bed.
 
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