"It's a blind entrance to the tunnel som'eres." They rose and trailed the light along the tracks, flattening themselves against the timbers of the tunnel as the form of Taylor Bill, faintly outlined in the distance, turned from the regular track, opened a great door in the side of the tunnel, which, to all appearances, was nothing more than the ordinary heavy timbering of a weak spot in the rocks, pulled it far back, then swerved the tram within.

Then, he stopped and raised a portable switch, throwing it into the opening.

A second later the door closed behind him, and the sound of the tram began to fade in the distance.

Harry went forward, creeping along the side of the tunnel, feeling his way, stopping to listen now and then for the sound of the fading ore car.

Behind him were Fairchild and Anita, following the same procedure.