Underground Comic
Actually there are lots of comics with various topics. And there are even a few which include caves. Pretty funny is the Little Asshole comic of German Walter Moers, with one story telling about a guided tour through a show cave. The little asshole is able to annoy the guide in no time.
Now there is a new comic about caves, from a different genre. UNDERGROUND is a five issue color series about Park Ranger Wesley Fischer as she tries to save Stillwater Cave. Its a sort of crime story or thriller.
The comic is written by Jeff Parker, drawn by Steve Lieber, and colored by Ron Chan. It is not published yet, but as a preview the first issue may be downloaded in black and white as a pdf file from their website.