You decide the best way to start is to look for signs of travel from other people. Even though you can't see very well ahead, you can at least see the ground and nearby walls just fine. As you search the area for clues, you happen to notice a satchel of sorts. It doesnt seem too dusty, so perhaps it was dropped recently. From the looks of things, it seems rather full. It seems kind of odd that someone would just drop a bag full of things, but it may contain something you can use like a map.
