There’s a reason some people are claustrophobic with regards to the subway or cave-diving. There are so many things to be afraid of. The roof collapsing, for example, or the exits getting blocked. A flood and nowhere to escape. Or maybe what might be already down there in the depths, just waiting for someone to come along. Creatures that thrive in the depths that we haven’t found yet. The subway getting stopped on the tracks with hundreds of people crammed inside, their anger stewing as the minutes tick by. There are many, many reasons to be afraid when you think about it. If you are one of those claustrophobic people, be warned this list may not be for you! To really dig into that fear, here are ten horror books that take place underground. Maybe you’ll think twice before getting on that subway after reading these horror books that take place underground. If you’re in the mood for more scary reads, pick up these horror books about demons or these great horror books/movie pairings!