M can be used to bring the map up. You can also you the mouse to select a conversation option. You start in the entry corridor. The wash room is to the south of the entry corridor. In the wash room there is a mirror.
Light reflects off of the mirror and illuminates a patch on the wall.
If the mirror is actioned then it moves so that the light now reflects onto a patch of moss on the opposite wall. The light dissolves the moss and eventually reveals a locked compartment. The outside of the compartment has a map of level 1 on it. The compartment can be opened with the key from the mine head machine puzzle. Inside you will find a shield that is needed in the orrery puzzle.