The tongue of boulders, spiked with driftwood, was firmly based against the wall of the cut. But it sloped up to within a few feet of the top of that gap, more than one landslide having contributed to its fashioning. The landing stage paralleled the river for perhaps some fifty feet. Beyond it water splashed a straight wall. They would have to climb and follow the stream along the top of the embankment, maybe being forced well away from the source of the water. By unspoken consent they both knelt and drank deeply from their cupped hands, splashing more of the liquid over their heads, washing the dust from their skins. Then they began to climb the rough assent up which the wolverines had already vanished. The murk above them was less solid, but again the fine grit streaked their faces, embedding itself in their hair. Shann paused to scrape a film of mud from his lips and chin. Then he made the last pull, bracing his slight body against the push of the wind he met there. A palm struck hard between his shoulders, nearly sending him sprawling. He had only wits enough left to recognize that as an order to get on, and he staggered ahead until rock arched over him and the sand drift was shut off. His shoulder met solid stone, and having rubbed the sand from his eyes, Shann realized he was in a pocket in the cliff walls. Well overhead he caught a glimpse of natural amber sky through a slit, but here was a twilight which thickened into complete darkness. There was no sign of wolverines. Thorvald moved along the pocket southward, and Shann followed him. Once more they faced a dead end. For the crevice, with the sheer descent to the river on the right, the cliff wall at its back, came to an abrupt stop in a drop which caught at Shann's stomach when he ventured to look down. If some battleship of the interstellar fleet had aimed a force beam across the mountains of Warlock, cutting down to what lay under the first envelope of planet-skin, perhaps the resulting wound might have resembled that slash. What had caused such a break between the height on which they stood and the much taller peak beyond, Shann could not guess. But it must have been a cataclysm of spectacular dimensions. There was certainly no descending to the bottom of that cut and reclimbing the rock face on the other side. The fugitives would either have to return to the river with all its ominous warnings of trouble to come, or find some other path across that gap which now provided such an effective barrier to the west. "Down!" Just as Thorvald had pushed him out of the murk of the dust storm into the crevice, so now did that officer jerk Shann from his feet, forcing him to the floor of the half cave from which they had partially emerged. A shadow moved across the bright band of sunlit sky.