Animated ocean trench environment for underwater scenes. Highly customizable, with multiple lighting and procedural material options included. The moving ocean waves create a beautiful, dynamic lighting effect inside the trench.

Includes a variety of lighting options, all stored in a lighting collection and labeled in the outliner.

 Also included is an HDRI (Fouriesburg Midday Pure Sky). When using the HDRI, consider enabling the "HDRI reflect-blocker" object to remove distracting reflections from the front of the water. 

The entire cliff object contains 1,004 vertices, and uses a non-destructive modifier stack for detailed texture. You can change or add rocks very easily, just copy the modifiers to any mesh and it will get a realistic rocky texture.

The above shows the cliff object with and without its modifier stack. The shape of the cliff is completely customizable, so you can edit, add, and remove vertices without losing any detail.

In addition to the modifier stack, the cliff also use a fully procedural material. There is no need to work with UV maps or baking, and the colors/textures can be quickly and easily tweaked in the material editor.

The sandy floor comes with a geometry node setup for starfish.  The starfish are distributed using a vertex group (labeled STARFISH) and can be customized in the weight paint editor.

Starfish setup uses a collection of 7 starfish meshes and randomized colors. Starfish colors can be altered in the material panel, just select new colors in the color ramp node (outlined above) and each starfish will be randomly assigned a color within that range. Each starfish mesh has its own material.