This is my first attempt to join the ranks of Illustration Friday. I confess it is now 12:36am Friday, and I just finish. I didn't realize I needed to post it so quickly.
I also thought that the topic was simply, "subterranean". I didn't notice the quote below.
I started my extensive brainstorming by looking up "subterranean" in the dictionary. The definition I read was,
"Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed"
