At this stage our plans received a rude shock. We were suddenly informed that we were to be moved to the Prisoner-of-War Camp at Yozgad (pronounced Useguard), eighty miles south-east of us. We were to be ready, said Sami Bey, to start within a week. After our experience of the departure from Kastamoni, we came to the conclusion it might equally well be a month before the necessary transport was collected. We determined, therefore, to push on with the tunnel at high pressure, and if necessary to bring it out to the surface short of the spot originally intended, and then one dark night to make a bolt for it. So the work went on. For the first three feet of the shaft we had found merely loose rubble and stones easily excavated, for the next thirteen we had had to dig out stones embedded in very hard mortar. Here we progressed only a few inches a day. Below this there was solid concrete. Every few feet we came to wooden ties holding the inner and outer casings together; but fortunately these were on one side of the hole, and we did not have to cut through them. At the time the move was announced we were at a depth of 16 feet, just entering the concrete. Here we were below the level of the lower storey, so we broke through the inner casing into the space beneath the platform. We now found, to our disgust, that the ground was on an average barely a foot below the joists, and the surface, being composed of dust which had been falling for eighty years between the boards of a Turkish barrack-room floor, was very unpleasant. Our disappointment, however, was counteracted by a stroke of good luck. At each end of the barrack room above there was an alcove, and we found beneath the nearer of the two alcoves an empty space 8 feet by 6 by 5. In this we could dispose of a good deal of the spoil from the tunnel. To get rid of the rest we should have to make a main burrow below the floor, filling up the remaining space on either side between the ground and the floor, and eventually packing the burrow itself with earth excavated from the mine. Should this again not suffice, the surplus earth would have to be pulled up by way of the shaft, and distributed under the boards of the upper-room platform. All that now remained for us to do before actually starting on the tunnel itself was to sink a secondary shaft about 6 feet deep, so as to get below the level of the concrete foundations. After this we could strike horizontally towards the Angora road.