Suddenly he stared at his screen and shouted. Donovan jumped up and went to Powell's desk.
Both men stared at the screen. They've gone crazy Donovan cried. On the screen they could see Dave and the sub robots. The seven robots were marching up and down a tunnel in the mine. The six sud robots were following Dave. They marched for twenty yards then they turned and marched back. They moved and turned together as if they were dancing.