system
apprehensive: I visited an underground cavern that was like 23 stories beneath the surface, i was uneasy to say the least. 
human
I recently went to ruby falls, an underground cavern with a waterfall. 
human
That sounds awesome. Have you ever been before?
human
Not that particular one, no. I had butterflies in my stomach on that elevator going down 23 stories.
human
I wish I could go sometime that sounds like quite the experience.
human
Overall it was a good time, but i was nervous being that far underground, i need to learn to relax and enjoy things.