Dr. Parker shook her head. "No. We didn't even know they existed."<br/><br/>The doctor had nothing more to say, staring wistfully at the floor. Lewis stood as well, seeming eager to move on as Rachel suggested.<br/><br/>The group got moving, heading off into the tunnel with flashlights leading the way. They moved for some time without encountering anything unusual, until the tunnel began to widen. The roof rose and soon they found themselves in an immense cavern. The tunnel floor narrowed to little more than a thin bridge passing over what looked to be a chasm beneath. About a hundred yards ahead the tunnel resumed. However, to get there, they would have to cross the natural stone bridge.<br/><br/>Lewis eyed the way ahead, glancing door into the sheer darkness to either side of the bridge. "Hmm. I hope the stone is secure. We might step on it and it just crumbles, dropping us down there."