forth, and once Don had to sidestep smartly to avoid a collision. As it lost control of buoyancy, the dying shark drifted up to the surface. Don did not bother to follow; that could wait until he had attended to more important business.
He found the cow and her two calves less than a mile away, and inspected them carefully. They were uninjured, so there was no need to call the vet in his highly specialized two-man sub which could handle any cetological crisis from a stomach-ache to a Caesarean.
The whales were no longer in the least alarmed, and a check on the sonar had shown that the entire school had ceased its panicky flight. He wondered if they already knew what had happened; much had been learned about their methods of communication, but much more was still a mystery.
"I hope you appreciate what I've done for you, old lady," he mut tered. Then, reflecting that fifty tons of mother love was a slightly awe- inspiring sight, he blew his tanks and surfaced.
It was calm, so he opened the hatch and popped his head out of the tiny conning tower. The water was only inches below his chin, and from time to time a wave made a determined effort to swamp him. There was little danger of this happening, for he fitted the hatch so closely that he was quite an effective plug.
Fifty feet away, a long gray mound, like an overturned boat, was rolling on the surface. Don looked at it thoughtfully, wondering how much compressed air he'd better squirt into the corpse to prevent it sinking before one of the tenders could reach the spot. In a few minutes he would radio his report, but for the moment it was pleasant to drink the fresh Pacific breeze, to feel the open sky above his head, and to watch the sun begin its long climb toward noon.
Don Burley was the happy warrior, resting after the one battle that man would always have to fight. He was holding at bay the specter of famine which had confronted all earlier ages, but which would never threaten the world again while the great plankton farms harvested their millions of tons of protein, and the whale herds obeyed their new masters. Man had come back to the sea, his ancient home, after aeons of exile; un til the oceans froze, he would never be hungry again. . . .
Yet that, Don knew, was the least of his satisfactions. Even if what he was doing had been of no practical value, he would still have wished to do it. Nothing else that life could offer matched the contentment and the calm sense of power that filled him when he set out on a mission such as this. Power? Yes, that was the right word. But it was not a power that would ever be abused; he felt too great a kinship with all the creatures who shared the seas with him—even those it was his duty to de stroy.
To all appearances, Don was completely relaxed, yet had any one of the many dials and lights filling his field of view called for attention he would have been instantly alert. His mind was already back on the Ror qual, and he found it increasingly hard to keep his thoughts away from his overdue breakfast. In order to make the time pass more swiftly, he started mentally composing his report. Quite a few people, he knew, were going to be surprised by it. The engineers who maintained the invisible fences of sound and electricity which now divided the mighty Pacific into manageable portions would have to start looking for the break; the ma rine biologists who were so confident that sharks never attacked whales would have to think up excuses. Both enterprises, Don was quite sure,
would be successfully carried out, and then everything would be under control again, until the sea contrived its next crisis.
But the crisis to which Don was now unwittingly returning was a man- made one, organized without any malice toward him at the highest offi cial levels. It had begun with a suggestion in the Space Department, duly referred up to the World Secretariat. It had risen still higher until it reached the World Assembly itself, where it had