After several minutes you notice a ledge which juts out from the chasm wall. It is located fifty feet or so directly above the place where you are currently standing. Close to this ledge you see a dark shadow. It marks the entrance to another tunnel, one that hopefully may lead all the way to the surface.
With renewed optimism, you recite the words of the Brotherhood Spell Levitation and at once you feel gravity losing its grasp. Assisted by this magic, you climb the rough chasm wall with ease and quickly reach the ledge above. Here you cancel the spell before hurrying into the new tunnel in search of a clear route to the surface.