Frank and Bob went up and down the beach, gathering sticks, and bits of broken boards, while Sammy continued to dig away inside the cave. Frank and Bob made several trips to and fro, and the pile of wood was growing.
Finally, as they neared the cave, on what they said would be their last trip, as they were tired, Frank cried:
"Look! The sand has caved in!"
"So it has!" exclaimed Bob.
They looked toward where the mouth of the cave had been. It was closed, and the sand was still sliding somewhat, showing that the accident must have happened only a little while before.
"And Sam—Sammy!" gasped Bob.
"He's in there!" faltered Frank.
"And we've got to get him out—quick!" cried Bob.
They both glanced up and down the beach. No one was in sight. Fortunately they had brought their shovels out of the cave.