Underwater Effect Script Removes Skybox and gives no effect

Hey guys So i am working on my game and one of my levels includes wated. (its basically a island ). But i have played the island demo and there is a underwater effect in that demo. i have searched for a script and i found one on the unifycommunity. The script said to attach it to the main camera so i did. when i went into play mode, there was no effect underwater at all and my skybox had disappeared completely. It was saying stuff about water planes and stuff so i didnt know if that had something to do with it. plz if anyone can help i will be so happy as it is a big feature in my game. any video tutorial links would be appreciated aswell. If you require the script here it is: //This script enables underwater effects. Attach to main camera.

//Define variables var underwaterLevel = 7;

//The scene's default fog settings private var defaultFog = RenderSettings.fog; private var defaultFogColor = RenderSettings.fogColor; private var defaultFogDensity = RenderSettings.fogDensity; private var defaultSkybox = RenderSettings.skybox; var noSkybox : Material;

function Start () { //Set the background color camera.backgroundColor = Color (0, 0.4, 0.7, 1); }

function Update () { if (transform.position.y < underwaterLevel) { RenderSettings.fog = true; RenderSettings.fogColor = Color (0, 0.4, 0.7, 0.6); RenderSettings.fogDensity = 0.04; RenderSettings.skybox = noSkybox; }

 else {
     RenderSettings.fog = defaultFog;
     RenderSettings.fogColor = defaultFogColor;
     RenderSettings.fogDensity = defaultFogDensity;
     RenderSettings.skybox = defaultSkybox;
 }

}