41 ROOM OF THREE DOORS. There are three heavy metal doors in this room. The door to Room 40 is open and mounted on the wall next to it is a huge piece of graphite that will crumble if touched.
Mounted on the wall next to each of the other doors is a huge diamond (15000 gold crescent value). Removing the diamond will cause the door to open. In the case of the door leading to Room 42, it will release the prisoner.
The door to Room 40 was similarly locked, but the diamond's power has worn out and it has turned to the worthless carbon material it is now.