The boys heard the caretaker creeping about in the darkness, and presently a piece of shale or coal was heard rattling down the old shaft.
"We'll have to get that blundering caretaker away from there," whispered Will. "If we don't, he'll notify the hold-up men that we're getting ready to do something! I've heard that about three-fourths of the people in the world object to doing anything unless they can take a brass band along, and I guess it's true."
"Say," Canfield whispered, calling back to the lads, "when that stone dropped down, I heard something that sounded like a paddle slapping down on the water. That room can't be wet yet, can it?"
"The Beaver call!" whispered Will.
"Right you are!" replied Dick. "The boys are there, all right!"
"Now the next thing to do is to find out if those highwaymen are watching them," declared Will.
"I'll tell you that in a minute," Dick whispered.
As the boy spoke, he passed one end of the rope to Canfield.
"Hang on to it, whatever takes place!" he whispered, "and I'll drop down and see what's going on."
"You must be very careful," warned Canfield.