This is a pretty common thing in the American Midwest. You see it a lot around houses on the tops of hills, especially in new construction. It looks kinda silly for a few years but it's the best you can do sometimes.
There could be a major road just out of frame. The trees are probably for a combination of windbreak (especially if this is amidst long stretches of open land), shade, and maybe privacy.
Who says you can't have an underground workshop, a gaming setup, a matrix+lemmy+mastodon server, an underground FTTH connection, an escape tunnel with a joyride leading straight to the highway and 100m below all of that, a nuclear power plant.
Ok, maybe someone will say something about the last one, but... You know?