In the previous render, the camera was at a depth of 75 feet below the water surface. (The ground is 100 feet down.)

In this render, the camera is only 20 feet below. Observe how the scattered light is arranged differently, because of the camera position.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)