Your mod only and it is a fresh game with your newest update. Yep it is dirt. I have only dug up the first layer so maybe if I go down a layer or 2 it might make a difference, but yea, I thought it was odd that no worms, that's why I thought I would ask.
I have a few treasure chests to go dig up, so maybe I will hit some then. I have only been digging for my base at this point.