The side of the mountain disappeared in the clouds above the tunnel. There was no way to tell how high that mountain extended above the bottom of the clouds. Bill could see the trees with their trunks below the clouds and their tops hidden, but that did not help any. He saw a deer, standing at first in an opening between the trees, suddenly turn and bound out of sight when it overcame its fright of the throbbing engines. Bill right there wished that he could change places with that deer.