DigWall

A DigWall is a GameObject with a DigWall tag that contains a collider that is non trigger. All these colliders are stored in digwall on GetDigWall which is only invoked by Start. If the GameObject contains multiple collider, only the first one will be stored. It is intended for the GameObject to only feature a single collider.

These colliders have a special property: on every LateUpdate, their enablement are always updated depending on if the player is digging or not. They are enabled only if the player isn't digging and disabled otherwise.

The intent is to have colliders that can act as a wall, but disappear once digging which effectively allows the player to go "through" a wall physically, but visually look as if they are digging under it. Since the ccol is still present when digging, this is how maps can have walls that looks like they can be passed under, but in reality, these are completely blocking walls whose colliders disables when digging. Since they need to block the player, they need to be non trigger colliders.

KeepDig

There is a related tag that can be used in addition to a DigWall and it's KeepDig. If defining one, it needs to be a trigger collider.

This one prevents the player to undig when colliding with it and it is intended to be placed inside the digging area so the player cannot undig while inside the geomertry of the underground passage. The collider needs to be trigger because it is only recognised by the PlayerControl's OnTriggerStay and it also allows passage.