Here his quarters were worse than he had ever known them. His cell was only six feet by ten, and the window was high, with bars without as well as within. The wall was seven feet thick, and beyond it was a palisade, which rendered it impossible for the sentinels to approach the window. On the other side the prisoner was shut in by three doors, and his food (which was not only bad, but very scanty) was passed to him through an opening. One thing only was in his favour. His cell was only entered once a week, so he could pursue any work to further his escape without much danger of being discovered. Notwithstanding the high window, the thick wall, and the palisade, notwithstanding too his want of money, he soon managed to open negotiations with the sentinels, and found, to his great joy, that the next cell was empty. If he could only contrive to burrow his way into that, he would be able to watch his opportunity to steal through the open door; once free he could either swim the Elbe and cross into Saxony, which lay about six miles distant, or else float down the river in a boat till he was out of danger. Small as the cell was, it contained a sort of cupboard fixed into the floor by irons, and on these Trenck began to work. After frightful labour he at last extracted the heavy nails which fastened the staples to the floor, and breaking off the heads (which he put back to avoid detection), he kept the rest to fashion for his own purposes. By this means he made instruments to raise the bricks. On this side also the wall was seven feet thick, and formed of bricks and stones. Trenck numbered them as he went on with the greatest care, so that the cell might present its usual appearance before the Wednesday visit of his guards. To hide the joins, he scraped off some of the mortar, which he smeared over the place. As may be supposed, all this took a very long time. He had nothing to work with but the tools he himself had made, which of course were very rough. But one day a friendly sentinel gave him a little iron rod, and a small knife with a wooden handle. These were treasures, indeed! And with their help he worked away for six months at his hole, as in some places the mortar had become so hard that it had to be pounded like a stone.