It had been carefully timbered to keep it from collapsing. The tunnel descended gently for some distance, until it pierced the water table and became a sort of unpleasant mire, and then it began to climb again. Jack saw lights burning ahead of him. He noticed that the floor of the tunnel was striped with a bright line of steaming blood. This triggered what little Jack had in the way of prudent instincts: he threw the torch into a puddle and nudged the horse along at a slow walk.