Searching for Underwater Effect

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Hi, I need one of those Undewater Sinus-Distortions.

Once I made a Demo for the Code Archives, an Underwater Scene with Hundreds of Fishes. Some months later somebody I cannot remember came up with a Modification of my Demo, featuring such a Distorion Effect. Unfortunately I have lost that source in a HD Crash. Maybe the Author is still around? It's about 15 Months ago...

Or maybe somebody else has a nice Underwater Screendistortion (probably sinus-based). It should be fast, I need it for some diving Situations in the Engine.