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This is a paid asset, but now you can download Digable 2D Terrain for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Digable 2D Terrain v1.1.10 (Latest version)
Make 2D Terrains and dig down through the ground.
Add destructible terrain to your game environment.
The destruction is based on line intersections.
You can easily make different shapes of terrain by moving editor handles.
The terrains have 2d colliders.
There are 9 different ground materials.
(Note : It doesn’t work with 2D Sprite Shape)