"Perhaps we ought to turn back now," George proposed, in a short time, seeing that they came no nearer to the boat in advance. "We left the main gangway some time ago, and we ought not to get too far away from it."
Will turned and looked back, facing only inky blackness.
"We should have stuck to the main gangway," he said. "I don't even remember when we left it. Is it very far back?"
"Some distance," answered George. "You see we followed this other boat without thinking what we were doing."
"Perhaps, if we continue to follow the other boat,' it will lead us somewhere. The fellow rowing must know something about the interior of the mine or he probably wouldn't be here!"
"I've been listening for a minute or more, trying to catch sound of the fellow's oars," George went on, "but there's nothing doing. I guess he's led us into a blind chamber and slipped away!"
"We don't, seem to be lacking for excitement," Will suggested with a grin. "We've lost Tommy and Sandy, and the machinery of the mine has been interfered with and the lower levels axe filling with water! Any old time we start out to do things, there's a general mix-up!"
"Aw, quit growling and listen a minute," suggested George.
The boys listened only for a moment when the sound George had heard was repeated. It was the call of the Wolf pack!