If this is the pit that i'm thinking of there should be an item in it somewhere near a corner. Then you have to ragdoll and it should teleport you back up to the beginning of the tutorial. (I haven't done it since the update first came out so i'm kinda blurry on the details.) lol but the ragdoll to teleport thing only works 1 time i'm pretty sure so if you already ragdolled and teleported back to tutorial start you have to redo it all.