In a short time they heard heavy footsteps in the tunnel. Their guard was returning.
Frank gripped the revolver. The lads pressed themselves against the wall. The footsteps drew closer. Then a dark figure emerged from the opening.
Frank stepped swiftly out behind the rascal and pressed the revolver against his back.
"Hands up!" he ordered sharply.
Their victim gave a cry of fright. He had been startled almost out of his wits. His hands shot up.
"Stand where you are!"
Frank still pressed the muzzle of the revolver against their erstwhile captor while Joe searched the man for weapons and found a small automatic in the fellow's hip pocket. This he took.
"Put your hands behind your back!" ordered Frank.
Their prisoner obeyed.
Quickly, Joe tied the man's wrists.