Brotherhood minions need to repair items in their home, but for this they need to gather up a lot of spanners of all sizes. To them it was not so lonely to travel through the underground maze and collect the keys and you go along with them. Complete wall very easy, especially if you know how to activate the necessary machinery. In one case it is enough to step on the mechanical button and the other is necessary to push a wooden box or a bend in the opposite direction the red lever.