Believe it or not, there's a shortage in real life. The world has been running out of sand and other fill dirt for a long time now.https://www.cnbc.com/2021/03/05/sand-shortage-the-world-is-running-out-of-a-cruc...
the
w h a t
why not just dig out a mountain like what we are doing
I mean, there's no sand under mountains. It's mostly granite.
