Kerans managed a weak smile. From the speed of his recovery he realised that he had suffered only mildly from the drowning. The remainder of the crew had moved away to their duties, no longer interested.

"Thank you, Strangman. I'll let you know when I have the answer."

On the way back to the Ritz he sat silently in the stern of the scow, thinking to himself of the great womb-chamber of the planetarium and the multilayered overlay of its associations, trying to erase from his mind the terrible 'either/or' which Strangman had correctly posed. Had he unconsciously locked the air-pipe, knowing that the tension in the cable would suffocate him, or had it been a complete accident, even, possibly, an attempt by Strangman to injure him? But for the rescue by the two skin divers (perhaps he bad counted on them setting out after him when the telephone cable was disconnected) he would certainly have found the answer. His reasons for making the dive at all remained obscure. There was no doubt that he had been impelled by a curious urge to place himself at Strangman's mercy, almost as if he were staging his own murder.

During the next few days the conundrum remained unsolved. Was the drowned world itself, and the mysterious quest for the south which had possessed Hardman, no more than an impulse to suicide, an unconscious acceptance of the logic of his own devolutionary descent, the ultimate neuronic synthesis of the archaeopsychic zero? Rather than try to live with yet another enigma, and more and more frightened of the real role that Strangman played in his mind, Kerans systematically repressed his memories of the accident. Likewise, Bodkin and Beatrice ceased to refer to it, as if accepting that an answer to the question would solve for them many of the other mysterious enigmas which now alone sustained them, delusions which, like all the ambiguous but necessary assumptions about their own personalities, they would only sacrifice with reluctance.