It happened a fourth time after there was a small cave in.
''tell me exactly what happened,'' said Powell.
'' An order was sent,'' the Finger replied. '' But before we received it,a new order was sent. We had to march in a strange way.''
'' tell us about the order,'' Donovan said. ''Was it the same order each time?''
''I don't know,'' said the Finger. '' There was never time to receive it.''
Powell told the finger to leave. Then he turned to Donovan,
''Mike, we've got to find out which order Dave gives,just before everything goes wrong, '' he said. ''We'll check everything the robots, the tunnels,and the machines that remove the ore from the mine.''
the men watched the screen for seven days.And then on the eighth day,Donovan stood up and threw a book at the screen,which broke.
Powell had just entered the room. '' why did you do that?'' he said.
'' I'm not watching the screen anymore, Greg! said Donovan.''In two days, we have to make our report. We haven't discovered anything! We've got to get close to the robots, and then make something go wrong.''
''What did the Finger tell us?'' Donovan went on. '' He told us that there's a problem when there might be a cave in, or after a cave in. Also,when the robots are doing difficult blasting, or working in dangerous areas.''
'' The problems happen when there's an emergency! said Powell excitedly.
''Yes,'' said Donovan.'' When Dave has to make a difficult choice,and there are no humans near him, he goes wrong.