"I wish we knew who the people are who are entering the tunnel," Will said. "It may be the robbers, or the detectives, or the sheriffs. It may even be your father, for all we know."
"Well, shall we move on down to see if we can find an outlet?" asked Chester. "That seems to me to be the best thing to do."
"It strikes me that that is the only thing we can do."
The boys were moving on down the almost level floor of the chamber in absolute darkness, for they did not consider it safe to show their electrics when they heard a chuckle in the darkness.
They drew up instantly and listened.
"That's Tommy!" declared Will.
"It can't be," replied Chester.
"Don't you suppose I know that chuckle?"
"Well, the boys weren't with the men I saw near the mouth of the cavern," declared Chester.
The boys listened again for some moments, and then caught sight of a finger of light far up the slope of the tunnel.