Open the door and enter the Cavern. Go to the control panel on the left of the walkway and open the doors. Note that the lever on the right is locked.
Click on the circles to change the passageways as follows:

Follow the pathways to the back of the bottom right structure and press the button to unlock the lever (bell and a green light).
Back to the control panel. Click on the circles to change the passageways as follows:

Close the doors and pull the lever on the right. The control panel rattles up and if you open the doors again there is a map for you to peruse.
Follow the pathways to the exit at the top left of the cavern. On your way, when you get to the top right cylinder, look west and see the monorail on the right. At the end of the end of the trail, turn round to face the cylinder. Press the button on the left to open the door behind you. Turn round and go inside. Flip down the lever on the right to power up the monorail.
Exit the room and walk back to the Control Panel.
Click on the circles to change the passageways as follows:

Follow the path to the back of the top left structure. Climb the ladder and jump into the monorail. Press the button for a gentle ride round the cavern. Turn right.
Click on the circles to change the passageways as follows:

Take the monorail back and follow the path to the cabinet behind the top
right structure. Press the button and open the cabinet...
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