German prison camps began to receive larger numbers of American prisoners. The Germans decided that new camps would be built specifically for US airmen. To allow as many people to escape as possible, including the Americans, efforts on the remaining two tunnels increased. This drew attention from guards and in September 1943 the entrance to "Tom" became the 98th tunnel to be discovered in the camp; guards in the woods had seen sand being removed from the hut where it was located. Work on "Harry" ceased and did not resume until January 1944.