Is it currently possible, or will it be, to create tunnels or caves with terraforming like in wurm? Not a major feature but quite a cool one. Reason I'm asking is because in the videos/screenshots i've seen there hasn't been any holes with a ground roof.
I can picture a tribe totem being placed on a hill and carving the inside out for added protection. Could add walls inside if possible or outside. Would be cool as well for the possibility of enemies or thieves digging under town walls and such to infiltrate them. (if destruction/terraforming of enemy tribe locations is allowed)