"Where are the others?" went on Dave, as he saw daylight ahead, much to his satisfaction.
"That we don't know," answered Phil. "But we are hoping they are safe."
"By the way, did you see Merwell and Haskers?" cried Dave, suddenly.
"Why, no—not since they ran away from our camp," returned Roger.
"I saw them—just before I found this opening. They were below me, the two of them and Sol Blugg."
"Maybe they got caught," muttered Phil.
No more was said just then, for the boys had to do some climbing over several big rocks, and needed their breath. Then they made a turn, and a moment later came out into the sunlight.
"Oh, how good it seems to be out in the air once more!" murmured Dave.
"Thank heaven, none of us were killed," added Roger.
"No more underground exploring for me," avowed Phil. "More than once I thought we would be buried alive!"