[adornKey]

I think the color of the ocean is an even more interesting subject than the color of the sky. There is even more interesting physics involved.

[mr_toad]

And biology. The amount of plankton in the water can tint the color noticeably .

[adornKey]

Yes, to all the the scattering, the sky has, you have water and other material relevant for absorption in the path. In the end even the colour of the ground might matter. In the past some people said, that the sea is blue, because it's a reflection of the blue sky, but that covers only a part of the problem.