Ten minutes to twelve
Once outside , they skirted the edge of the building , staying close to the hedge , and then struck out boldly across the canyon floor toward the prison building . They were surprised to see that their smashing attack had gone unnoticed , and Connel reasoned that the constant roar of activity in the canyon had covered the sounds of their raid . `` We 'll have to hurry , sir , '' said Astro as they turned into the lane leading to the prison . `` Ten minutes to twelve . '' `` It 's no good , Astro , '' said Connel , suddenly pulling the cadet back and pointing to the building . `` Look at all the guards -- at least a dozen of them . '' Astro waited a second before saying grimly , `` We could try , sir . ''