"Get out yourself!"
"Gee, it looks as if the whole roof might come down!"
"I got some dust in my eyes."
"Same here. Say, this is the worst yet."
"Humph! We'll be lucky if we are not buried alive."
Much crestfallen, the boys bumped into each other, rubbing their eyes and clearing their throats of the dry dust that had come down with the rocks.
Then they gazed at each other in dismay, and not without reason.
All the boys' work was undone. The barrier was now larger than it had ever been.
"That fixes it!" said Frank gloomily.
The ledge of rock that had given way was of such extent that it was impossible for any one to move it. Their path was completely blocked.