“Let’s go back—that looks scary to me!” Florence exclaimed quickly. “It might cave in.”
“No, that small a crack couldn’t be dangerous. Come on.”
Jo Ann started on again, and reluctantly Florence followed. In spite of her seeming indifference to danger, Jo Ann was really examining the walls and top more cautiously than ever.
“Here’s another crack!” she exclaimed a few minutes later. “Maybe there’s been an earthquake near here. They do have earthquakes down here sometimes, don’t they?”
“Yes, now and then—slight ones,” Florence replied. “Don’t you think we’d better go back? Poor Peg may be getting lonesome, and we told her we wouldn’t be gone long.”
Jo Ann half smiled. “Maybe she is, but let’s go a little farther. Surely we’ll come to the end of this tunnel soon.”
“There’s no telling how long it is—it might be miles long. Let’s go back.”
“In a minute. I see something ahead—something whitish. Maybe it’s a little opening and the moonlight’s shining through.” Jo Ann stopped and pointed directly ahead.
“Oh, I do see it!” Florence exclaimed. “It does look white.”
Eagerly Jo Ann led the way onward, but not without watching for anything that might be dangerous. When they had gone a few yards farther, she suddenly cried, “Why, it’s a cave-in!”