By evening the rainfall started, slashing at the huge umbrellas a hundred feet above, the black light only broken when the phosphorescent rivers of water broke and poured down on him. Frightened of resting for the night, he pressed on, shooting off the attacking iguanas, darting from the shelter of one massive tree-trunk to the next. Here and there he found a narrow breach in the canopy overhead, and a pale light would illuminate a small clearing where the ruined top floor of a sunken building loomed through the foliage, the rain beating across it. But the evidence of any man-made structures was increasingly scanty, the towns and cities of the south swallowed by the rising silt and vegetation.