So I had a thought, how deep can a terraformed hole go? I know that the limiting factor is if the edges become to steep. To get around that you dig those steeps, and so forth.
So my question is, where is the biggest, continuous piece of land (preferably a square) in World 10?
http://odditown.com/haven/map/#x=38.25&y=5.21&zoom=4
Where could the theoretical biggest hole ever be dug?