They passed from chamber to chamber and finally came to a place where the slope was upward.
"I guess we've struck it at last!" Sandy exclaimed.
"But there are no rails here!" Tommy argued.
"Then we're on the wrong track again," admitted Sandy.
He bent down to the rock with his searchlight and pointed out evidences that the passage had once been laid with rails.
"When they strip a chamber or a counter gangway," he said, "they take away the rails. It seems that we are now in a part of the Labyrinth mine which has been worked out."
"I know what to do!" exclaimed Tommy. "I'll give the call of the Beaver Patrol and tell those ginks who have been giving the call of the pack that we're lost! That ought to bring them out of their holes."
The Beaver call was given time after time, but no reply came.
"Say," Tommy said after his patience had become exhausted, "I believe it's daylight. Look at your watch. I left mine in the bed!"
"I left mine in bed, too," answered Sandy. "I know it is day, because
I'm hungry."