How to dig the surface?

2D
1

Is it possible to make the opportunity to dig a surface in Unity? That is, to destroy the surface not by blocks, and the curves cut from the surface?

2

see destruct 2d asset on asset store… or there are other ways to do it. destructible terrain is probably what you want

3

Yes.
Research voxels.

Oops. 2D.
@JoeStrout and @MD_Reptile have great threads about this topic.