"Just what we've been looking for!" chuckled Cameron.
"We surely have them trapped now!" replied Fenton.
"They'll naturally step into the outer cavern to see why their chums don't walk out, and when they do so, we'll hold them up with our guns until we can build up a barrier which will keep them in."
"One of the boys certainly must understand the code we are so anxious about," Fenton observed. "That's the kid we want. We've certainly got to find out what that message contains! If the people in the east are trying to steal our plans, we certainly ought to know it!"
The boys, however, heard nothing of this talk and passed on down the north side of the creek. As soon as they came opposite the cavern, in sight of the light once more, they stopped and began signalling.
As they did so, Cameron and Fenton came nearer and waited anxiously for the lads to enter the cavern.
"I'd like to know what all that signalling means!" said Cameron.
"Boy Scout signals," replied Fenton.
"You can't read them, can you?" asked the miner.
"Of course not," replied Fenton, "I'm no Boy Scout!"