And now as regards the difficulty of entering the cellar. The cooking-room on the first floor contained, in its thick brick and stone partition, a fireplace, in front of which, partly masking it, three stoves were placed for the cooking operations of the prisoners. The floor of this fireplace was chosen as the initial point of excavation, from which a sloping passage might be made, under the floor of the next room, into the disused cellar. Captain Hamilton, a stonemason by trade, began the excavation, removing the first brick and stone from the fireplace. It need scarcely be said that this work was done only at night, and with as little noise as possible. By day the opening was carefully closed, the bricks and stones being so ingeniously replaced that no signs of disturbance appeared. Thick as the wall was, a passage was quickly made through it, presenting an easy route to the cellar below. As for this cellar, it was dark, rarely or never opened, and contained only some old boxes, boards, straw, and the like d['e]bris, and an abundance of rats. The cellar reached, and the route to it carefully concealed by day alike from the prison authorities and the prisoners not in the secret, the question of the tunnel followed. There were two possible routes. One of these led southward, towards the canal; the other eastward, under a narrow street, on the opposite side of which was a yard and stable, with a high board fence on the street side. The opposite side of the yard faced a warehouse. A tunnel was commenced towards the canal. But it quickly struck a sewer whose odor was more than the workers could endure. It was abandoned, and a tunnel begun eastward, the most difficult part of it being to make an opening in the thick foundation wall. The hope of liberty, however, will bear man up through the most exhausting labors, and this fatiguing task was at length successfully performed. The remainder of the excavation was through earth, and was easier, though much the reverse of easy. A few words will tell what was to be done, and how it was accomplished. The tunnel began near the floor of the cellar, eight or nine feet underground. Its length would need to be seventy or eighty feet. Only one man could work in it at a time, and this he had to do while crawling forward with his face downward, and with such tools as pocket-knives, small hatchets, sharp pieces of wood, and a broken fire-shovel. After the opening had made some progress two men could work in it, one digging, the other carrying back the earth, for which work frying-pans were brought into use. Another point of some little importance was the disposal of the dirt. This was carelessly scattered over the cellar floor, with straw thrown over it, and some of it placed in boxes and barrels. The whole amount was not great, and not likely to be noticed if the officials should happen to enter the cellar, which had not been cleaned for years.