Six coils link it with Gallifrey and the Master begins to unfasten them. The Doctor begins to escape in the only possible way- up a service shaft. As the Master unconnects the first coil, the balance of Gallifrey is already disturbed. As the Master reaches the end of his task, the Doctor arrives in the chamber. By now, the Panopticon and the city are crumbling around them.
Cracks begin to appear in the floor and there is a struggle.
The Doctor manages to force the Master into one of the vast chasms. He reconnects the coils and Gallifrey is saved. The Doctor says goodbye to his old tutor Borusa who awards him nine out of ten for this effort. He warns before departing that the Master might not be dead. He is free once more, and stronger too, after his contact with the Eye of Harmony.