> This seems like correct science to me. I understand the physics involved. I heard the words "refraction" and "density" at school so it must be science.

> This seems like correct science to me. I understand the physics involved. I heard the words "refraction" and "density" at school so it must be science. I'm not attacking you, I'm just genuinely curious what your words meant because sometimes I'm under impression that there are too many people of the second kind. Gives me the feeling that I might be paranoid :) FWIW, I have no idea how and why should water acoustics produce such distortion.