Arthur Clarke: The Deep Range

First published in Great Britain 1968 by Victor Gollancz Ltd

In this novel I have made certain assumptions about the maximum size of various marine animals which may be challenged by some biologists. I do not think, however, that they will meet much criticism from underwater explorers, who have often encountered fish several times the size of the largest recorded specimens.

For an account of Heron Island as it is today, seventy-five years before the opening of this story, I refer the reader to The Coast of Coral, and I hope that the University of Queensland will appreciate my slight extrapolation of its existing facilities.

1956

There was a killer loose on the range. The South Pacific air patrol had seen the great corpse staining the sea crimson as it wallowed in the waves. Within seconds, the intricate warning system had been alerted; from San Francisco to Brisbane, men were moving counters and drawing range circles on the charts. And Don Burley, still rubbing the sleep from his eyes, was hunched over the control board of Scoutsub 5 as it dropped down to the twenty-fathom line.

He was glad that the alert was in his area; it was the first real excitement for months. Even as he watched the instruments on which his life depended, his mind was ranging far ahead. What could have happened? The brief message had given no details; it had merely reported a freshly killed right whale lying on the surface about ten miles behind the main herd, which was still proceeding north in panic-stricken flight. The obvious assumption was that, somehow, a pack of killer whales had managed to penetrate the barriers protecting the range. If that was so, Don and all his fellow wardens were in for a busy time.

The pattern of green lights on the telltale board was a glowing symbol of security. As long as that pattern was unchanged, as long as none of those emerald stars winked to red, all was well with Don and his tiny craft. Air — fuel — power — this was the triumvirate that ruled his life. If any one of these failed, he would be sinking in a steel coffin down toward the pelagic ooze, as Johnnie Tyndall had done the season before last. But there was no reason why they should fail, and the accidents one foresaw, Don told himself reassuringly, were never those that happened.

He leaned across the tiny control board and spoke into the mike. Sub 5 was still close enough to the mother ship for radio to work, but before long he’d have to switch to the ultrasonics.

“Setting course 255, speed 50 knots, depth 20 fathoms, full sonar coverage. Estimated time to target area 40 minutes. Will report at ten-minute intervals until contact is made. That is all. Out.”

The acknowledgment from the Rorqual was barely audible, and Don switched off the set. It was time to look around.

He dimmed the cabin lights so that he could see the scanner screen more clearly, pulled the Polaroid glasses down over his eyes, and peered into the depths. It took a few seconds for the two images to fuse together in his mind; then the 3-D display sprang into stereoscopic life.

This was the moment when Don felt like a god, able to hold within his hands a circle of the Pacific twenty miles across, and to see clear down to the still largely unexplored depths two thousand fathoms below. The slowly rotating beam of inaudible sound was searching the world in which he floated, seeking out friend and foe in the eternal darkness where light could never penetrate. The pattern of soundless shrieks, too shrill even for the hearing of the bats who had invented sonar millions of years before man, pulsed out into the watery night; the faint echoes came tingling back, were captured and amplified, and became floating, blue-green flecks on the screen.

Through long practice, Don could read their message with effortless ease. Five hundred feet below, stretching out to the limits of his submerged horizon, was the Scattering Layer — the blanket of life that covered half the world. The sunken meadow of the sea, it rose and fell with the passage of the Sun, hovering always at the edge of darkness. During the night it had floated nearly to the surface, but the dawn was now driving it back into the depths.

It was no obstacle to his sonar. Don could see clear through its tenuous substance to the ooze of the Pacific floor, over which he was driving high as a cloud above the land. But the ultimate depths were no concern of his; the flocks he guarded, and the enemies who ravaged them, belonged to the upper levels of the sea.

Don flicked the switch of the depth selector, and his sonar beam concentrated itself into the horizontal plane. The glimmering echoes from the abyss vanished, and he could see more clearly what lay around him here in the ocean’s stratospheric heights. That glowing cloud two miles ahead was an unusually large school of fish; he wondered if Base knew about it, and made an entry in his log. There were some larger blips at the edge of the school — the carnivores pursuing the cattle, ensuring that the endlessly turning wheel of life and death would never lose momentum. But this conflict was no affair of Don’s; he was after bigger game.

Sub 5 drove on toward the west, a steel needle swifter and more deadly than any other creature that roamed the seas. The tiny cabin, now lit only by the flicker of lights from the instrument board, pulsed with power as the spinning turbines thrust the water aside. Don glanced at the chart and noted that he was already halfway to the target area. He wondered if he should surface to have a look at the dead whale; from its injuries he might be able to learn something about its assailants. But that would mean further delay, and in a case like this time was vital.

The long-range receiver bleeped plaintively, and Don switched over to Transcribe. He had never learned to read code by ear, as some people could do, but the ribbon of paper emerging from the message slot saved him the trouble.

AIR PATROL REPORTS SCHOOL 50-100 WHALES HEADING 95 DEGREES GRID REF X186593 Y432011 STOP MOVING AT SPEED AFTER CHANGE OF COURSE STOP NO SIGN OF ORCAS BUT PRESUME THEY ARE IN VICINITY STOP RORQUAL

Don considered this last piece of deduction highly unlikely. If the orcas — the dreaded killer whales — had indeed been responsible, they would surely have been spotted by now as they surfaced to breathe. Moreover, they would never have let the patrolling plane scare them away from their victim, but would have remained feasting on it until they had gorged themselves.

One thing was in his favor; the frightened herd was now heading almost directly toward him. Don started to set the coordinates on the plotting grid, then saw that it was no longer necessary. At the extreme edge of his screen, a flotilla of faint stars had appeared. He altered course slightly, and drove head on to the approaching school.

Part of the message was certainly correct; the whales were moving at unusually high speed. At the rate they were traveling, he would be among them in five minutes. He cut the motors and felt the backward tug of the water bringing him swiftly to rest.

Don Burley, a knight in armor, sat in his tiny, dim-lit room a hundred feet below the bright Pacific waves, testing his weapons for the conflict that lay ahead. In these moments of poised suspense, before action began, he often pictured himself thus, though he would have admitted it to no one in the world. He felt, too, a kinship with all shepherds who had guarded their flocks back to the dawn of time. Not only was he Sir Lancelot, he was also David, among ancient Palestinian hills, alert for the mountain lions that would prey upon his father’s sheep.