I have managed to scare my party completely off of going underground ever again (or so they say) after 5-6 sessions which took place over only a handful of game days but, due to various absences, took a few months to play out in real time. Almost every session, if there is any possibility that they think I might be trying to lure them into a cave, they will talk about how nerve-wracking that experience was. "It felt like we were down there forever!"

I don't mind having to come up with dungeons that are mostly above ground, though you can be sure I'll find a way to get them back down below somehow. At which point I'm going to try my hardest to make my caves more interesting, and this kind of info is just what I need. Thanks, Alexis.