Corridor for you, thank you very much. If there's one thing you know about holes, it's that they're hard to climb out of, so in one is the last place you want to be. You instead travel deeper and deeper into this cave that goes an unexpectedly long distance in and down. In fact, by the time you come out of it, you seem to have walked yourself into a whole new environment. You're in a giant chamber, well lit, and are shocked to see giant plants, big insects, giant fungus, and (sorry for burying the lede here) dinosaurs moving about here.