The Fear and the Adventure I was 2,500 feet underground with simply a lamp fuel light. This post is an epic 3-4 hour underground voyage that takes fearless spelunkers between the celebrated Sumaguing and Lumiang Caves. It strikes dread into the heart of the claustrophobic, the still-anxious about the dim, and the for the most part inclined to frenzy. I am every one of the three of those things. Siennaoutdoorholiday.com