His first coherent thought was that his speculation concerning the reality of this experience was at last resolved. This could not possibly be an hallucination; at least this particular sequence of events was not. And he was still hazily considering that when a hand fell on his shoulder, fingers biting into his raw flesh. Shann snarled, rolled over on his side. Thorvald, water dripping from his rags--or rather steaming from them--his shaggy hair plastered to his skull, sat there. "You all right?" Shann sat up in turn, shielding his smarting eyes. He was bruised, battered badly enough, but he could claim no major injuries. "I think so. Where are we?" Thorvald's lips stretched across his teeth in what was more a grimace than a smile. "Right off the map, any map I know. Take a look." They were on a scrap of beach--beach which was more like a reef, for it lacked any covering comparable to sand except for some cupfuls of coarse gravel locked in rock depressions. Rocks, red as the rust of dried blood, rose in fantastic water-sculptured shapes around the small semi-level space they had somehow won. This space was V-shaped, washed by equal streams on either side of the prong of rock by water which spouted from the face of a sheer cliff not too far away, with force enough to spray several feet beyond its exit point. Shann seeing that and guessing at its significance, drew a deep breath, and heard the ghost of an answering chuckle from his companion. "Yes, that's where we came out, boy. Like to make a return trip?" Shann shook his head, and then wished that he had not so rashly made that move, for the world swung in a dizzy whirl. Things had happened too fast. For the moment it was enough that they were out of the underground ways, back under the amber sky, feeling the bite of Warlock's sun. Steadying his head with both hands, Shann turned slowly, to survey what might lie at their backs. The water, pouring by on either side, suggested that they were again on an island. Warlock, he thought gloomily, seemed to be for Terrans a succession of islands, all hard to escape. The tangle of rocks did not encourage any exploration. Just gazing at them added to his weariness. They rose, tier by tier, to a ragged crown against the sky. Shann continued to sit staring at them. "To climb that...." His voice trailed into the silence of complete discouragement. "You climb--or swim," Thorvald stated. But, Shann noted, the Survey officer was not in a hurry to make either move.