six o'clock
My uncle was scarcely able to conceal his impatience and dissatisfaction at the road continuing still to advance in a horizontal direction . The darkness , dense and opaque a few yards in advance and in the rear , rendered it impossible to make out what was the length of the gallery . For myself , I began to believe that it was simply interminable , and would go on in the same manner for months . Suddenly , at six o'clock , we stood in front of a wall . To the right , to the left above , below , nowhere was there any passage . We had reached a spot where the rocks said in unmistakable accents -- No Thoroughfare . I stood stupefied .