was no way yet of telling if Franklin possessed it. Not until Don had watched his reactions as he sank down into the depths of the sea would he know whether all this effort was to be of any use.
There was so much that Franklin had to learn that it seemed impossible that anyone could absorb it all in two months, as the program in sisted. Don himself had taken the normal six months, and he somewhat resented the assumption that anyone else could do it in a third of the time, even with the special coaching he was giving. Why, the mechanical side of the job alone—the layout and design of the various classes of subs—took at least two months to learn, even with the best of instruc tional aids. Yet at the same time he had to teach Franklin the principles of seamanship and underwater navigation, basic oceanography, subma rine signaling and communication, and a substantial amount of ichthyol ogy, marine psychology, and, of course, cetology. So far Franklin had never even seen a whale, dead or alive, and that first encounter was something that Don looked forward to witnessing. At such a moment one could learn all that one needed to know about a man's fitness for this job.
They had done two weeks' hard work together before Don first took Franklin under water. By this time they had established a curious re lationship which was at once friendly and remote. Though they had long since ceased to call each other by their surnames, "Don" and "Walt" was as far as their intimacy went. Burley still knew absolutely nothing about Franklin's past, though he had evolved a good many theories. The one which he most favored was that his pupil was an extremely talented criminal being rehabilitated after total therapy. He wondered if Franklin was a murderer, which was a stimulating thought, and half hoped that this exciting hypothesis was true.
Franklin no longer showed any of the obvious peculiarities he had revealed on their first meeting, though he was undoubtedly more nervous and highly strung than the average. Since this was the case with many of the best wardens, it did not worry Don. Even his curiosity about Frank lin's past had somewhat lessened, for he was far too busy to bother about it. He had learned to be patient when there was no alternative, and he did not doubt that sooner or later he would discover the whole story. Once or twice, he was almost certain, Franklin had been on the verge of some revelation, but then had drawn back. Each time Don had pre tended that nothing had happened, and they had resumed their old, im personal relationship.
It was a clear morning, with only a slow swell moving across the face of the sea, as they walked along the narrow jetty that stretched from the western end of the island out to the edge of the reef. The tide was in, but though the reef flat was completely submerged the great plateau of coral was nowhere more than five or six feet below the surface, and its every detail was clearly visible through the crystal water. Neither Frank lin nor Burley spared more than a few glances for the natural aquarium above which they were walking. It was too familiar to them both, and they knew that the real beauty and wonder of the reef lay in the deeper waters farther out to sea.
Two hundred yards out from the island, the coral landscape suddenly dropped off into the depths, but the jetty continued upon taller stilts until it ended in a small group of sheds and offices. A valiant, and fairly suc cessful, attempt had been made to avoid the grime and chaos usually inseparable from dockyards and piers; even the cranes had been de signed so that they would not offend the eye. One of the terms under which the Queensland government had reluctantly leased the Capricorn Group to the World Food Organization was that the beauty of the islands
would not be jeopardized. On the whole, this part of the agreement had been well kept.
"I've ordered two torpedoes from the garage," said Burley as they walked down the flight of