The boys were listening for some answer to their shouts when he arrived, and so they paid little attention to his numerous questions.
"There is no time to lose," Canfield went on. "I"ll go to the top at once and call an engineer and a couple of firemen. When you find the beat, take a trip down the main gangway here and stick your lights into all the cross-headings and chambers you see. But, above all," he continued, "don"t fail to leave a light here at a shaft, and be careful that you never pa.s.s out of sight of it."
Canfield hastened away, climbing the ladders two rungs at a time, and soon disappeared into the little dot of light at the top.
The two boys searched patiently for the boat for a long time, but did not succeed in discovering it. At last, Will suggested that it might be in the mule stable and thither they went.
The boat was there, in excellent condition, and the boys soon had it swinging to and fro on the surface of the water which now lay several feet deep in the main gangway.
"Jerusalem!" exclaimed George, taking the depth of the water with an oar, "if the water is four feet deep here, how deep must it be at the middle of the dip?"
"About forty rods, I should think!" exaggerated Will.
The boys left a large searchlight at the shaft so situated that it looked straight down the pa.s.sage they proposed following, and started away in the boat. The flashlights illuminated only a small portion of the underground place, but the boys could see some distance straight ahead.
Once they ceased rowing to listen, believing that they had heard calls from the darkness beyond. The sound was not repeated, and they were about to proceed when a sound which brought all their nervous energy into full swing reached their ears.
It was a b.u.mping of an oar or paddle against the side of a boat. The blow echoed through the cavern as sharply as a pistol shot might have done. There could be no mistake in the cause.
"Now who"s in that other boat?"
"Somehow," George grumbled in a whisper, "we always have propositions like that put up to us! There"s always a mystery in every trip we take! We found one on Lake Superior, and one in the Florida Everglades, and one at the top of the Rocky mountains and one in the Hudson Bay wilderness."
"Yes, and we solved them, too!" grinned Will. "And we"re going to solve this one! You remember about my seeing some one sneaking in here just ahead of us, don"t you?"
"Yes," was the answer. "You thought it was that b.u.m detective."
"I think so yet," replied Will.
"If it"s the detective," asked George, "why didn"t he give the alarm when he found that the mine was being flooded. He might at least have done that and saved the company a great deal of expense and trouble."
"Give it up," replied Will. "I might ask you," he went on, "why he was rowing away into a flooded mine which is supposed to be deserted."
"And I"d have to give you the answer you gave me," George declared.
The boys could now hear the strokes of the oarsman who was in the lead quite regularly and distinctly. Now and then he turned into crossheadings and chambers, as if to escape from their surveillance, but they kept steadily on after him, not taking into account the fact that they were leaving the light they had set at the shaft far out of view.
"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!
CHAPTER VI
THE BEAVER CALL
"That"s Tommy!" exclaimed Will.
"I never knew that he belonged to the Wolf Patrol!" George observed.
"He might give the call without belonging to the Patrol!" urged Will.
The boys listened, but the sound was not repeated, although they called out the names of their chums and gave the Beaver call repeatedly.
"I guess it was a dream," George suggested.
"Then it was the most vivid dream I ever had!" Will declared.
They rowed about the chamber for some moments, searching for the source of the call, but to no purpose.
"Let"s go back to the shaft," urged George.
"I"m agreeable," answered Will. "The only question now is whether we can find the shaft. The water is so deep that all branches of the mine look alike to me!"
In pa.s.sing out of the chamber into another pa.s.sage the boys were obliged to stoop low in order to avoid what is called a dip.
After pa.s.sing under the dip so close to the ceiling that the boys were obliged to lie down in the boat in order to protect their heads, they came to a large chamber which seemed to be fairly dry save in the center, where there was a depression of considerable size.
"Nothing doing here!" Will exclaimed as he flashed his searchlight around the place. "This chamber looks as if there hadn"t been an ounce of coal mined here for a hundred years."
"Then let"s get out," George proposed, "and make our way back to the shaft if possible. If we can"t, we"ll make noise enough to attract Canfield"s attention and let him come and lead us out."
"Here we go, then," cried Will, giving the boat a great push toward the dip. "We can"t get out any too fast."
The boat came up against a solid projection of rock!
"I don"t seem to see any way out!" George exclaimed.
"Well, it"s there somewhere!" declared Will.