Download Underwater FX FREE Unity. 

This Underwater FX pack provides a wide range of objects and effects to bring your underwater environment alive.

The complete list of assets include:

* 6 coral rocks (with and without caustics effect)
* 4 corals
* Bubbles particles (3 different sizes)
* Sea bed sand (with and without caustics effect)
* Animated jellyfish
* Animated fish
* Animated waterweed
* Floating particles
* Undersea background sphere
* Grass
* Underwater audio (looping)

Custom scripts for the caustics (scrolling UVs), and shaders (for the undersea background) are also included.