Detail this asset from Unity Asset Store: https://assetstore.unity.com/packages/vfx/particles/environment/underwater-fx-61157
But now you can download Underwater FX FREE.
Underwater FX 1.4
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
* Underwater audio (looping)
Custom scripts for the caustics (scrolling UVs), and shaders (for the undersea background) are also included.
Also available is the Animating Fish pack.
unityassetcollection.com – Get all paid Unity Asset for free