"Did you see that light down there?"

"Light nothing!" declared Sandy.

"But I did see a light!" insisted the other.

"Perhaps you did," replied Sandy, "but if there's any light there it's
merely a reflection from our electrics. There may be a metallic
surface down there which throws back the light rays."

"Have it your own way!" grunted Tommy. "You know yourself that the
caretaker said there were lights in the mine which no one could
account for and he especially mentioned the light in Tunnel Six.

"All right!" Sandy grinned. "We'll sneak down so quietly that any
person who happens to be at the bottom of the shaft with the light
will never suspect that we are within a hundred miles of the place.
We may be able to geezle the fellow that's making the ghost walk
around here nights."

The boys took to the ladders and moved down as silently as possible.
Now and then a rung creaked softly under their feet, but they got to
the bottom without any special mishap.

Tommy drew a long breath when at last they landed at the bottom of the
shaft. He threw his light upward, then, and declared that in his
opinion they were at least ten thousand feet nearer the center of the
earth than they were when they started down.

"I remember now," Sandy said with a grin, "that the Labyrinth mine is