Castaway's Journal - Day 18

I decided to distance myself from the tower and have begun to explore other areas.
There are places in each area that appear to be vast caverns.
They appear to have traces of human involvement, and ore can be found throughout them.
Could someone have used Pals to dig those holes?
I can't help but feel overwhelmed by all the mysteries I'm unable to solve, but my Pals have come with me no matter where I go.
As long as I have food to give them, that is.