It meant time lost, of course. It meant that precious time, which should be given to building his communicator, must be given over to what was merely a protective action. But there was nothing to do but go on. It would never have occurred to the Nipe to give up, for to quit meant to die. And to die--here, now--was unthinkable. His alarms were all functioning, his defenses all set. He could now leave his hideaway knowing that if it were broken into while he was away he would be warned in time. But he had no real fear of that. He had done everything he could do. And no intelligent creature, to the Nipe's way of thinking, would waste time worrying about a situation he could not improve upon. Taking with him the equipment he needed for the job he had to do, he entered the tunnel that ran southward from his base of operations. Once, as he moved along, one of the little quadrupeds approached him, its teeth bared. With an almost negligent flip of one powerful, superfast hand, he slammed it against a nearby wall. It dropped and lay still. Another of its kind approached it cautiously. The Nipe noticed the approach with approval. The quadrupeds had no real intelligence, but they had the proper instincts. At last the Nipe came to another of the many places where the tunnels met with others of the network. He crossed through several rooms, all very large and cluttered with the dusty, long-dead bones of hundreds of the local intelligent life-form--if (and he was not sure in his own mind of this) they could actually be called intelligent. But he moved carefully, stepping over the human bones and the empty, staring skulls. They had apparently been properly devoured, although he could not be sure whether it had been done by their own kind or by the little quadrupeds. Nonetheless, he would not willingly disturb their repose. He went on into the tunnel that led westward and followed it as it began to angle down. Finally he came to the water's edge. To a human being, the cold expanse of water that gleamed like ink in the light of the Nipe's illuminator would have been a barricade as impenetrable as steel. But to the Nipe the tidal pool was simply another of his defenses, for it concealed the only entrance he ever used. He went in after adjusting his scuba mask and began swimming toward the opening that led to the estuary of the sea, his eight strong limbs working in unison in a way that would have been the envy of a rowing team. At the jagged hole in the tunnel wall, the gap that led into open water, he paused to check his instruments. Only after he was certain that there were no sonar or other detector radiations did he propel himself onward, out into the estuary itself.