Frank said, resting for a moment. "Still, if we can only clear a small opening it'll be enough to let us out."
He attacked the barricade again with renewed vigor.
Wrenching at a large rock, he tugged and pulled until it became dislodged from the surrounding débris. Frank was just dragging the huge stone away when there came a warning rumble, a cry of alarm from Joe, and he leaped back.
He was just in time.
With a crash, a large section of the roof caved in, a flat ledge of rock just missing his head by inches. A mass of rubbish descended with a roar.
"Get out of the way!"
"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.
