The Sentinel Part 7

Yet was it a lie? What had he really seen? No more, he was certain, than Karellen had intended. He was as sure as he could be of anything that the Supervisor had known his plan from the beginning, and had foreseen every moment of its final act.

Why else had that enormous chair been already empty when the circle of light blazed upon it? In the same moment he had started to swing the beam, but he was too late. The metal door, twice as high as a man, was closing swiftly when he first caught sight of it-closing swiftly, yet not quite swiftly enough.

Karellen had trusted him, had not wished him to go down into the long evening of his life still haunted by a mystery he could never solve. Karellen dared not defy the unknown powers above him (were they of that same race too?) but he had done all that he could. If he had disobeyed Them, They could never prove it.

"We have had our failures."

Yes, Karellen, that was true: and were you you the one who failed, before the dawn of human history? It must have been a failure indeed, for its echoes to roll down all the ages, to haunt the childhood of every race of man. Even in fifty years, could you overcome the power of all the myths and legends of the world? the one who failed, before the dawn of human history? It must have been a failure indeed, for its echoes to roll down all the ages, to haunt the childhood of every race of man. Even in fifty years, could you overcome the power of all the myths and legends of the world?

Yet Stormgren knew there would be no second failure. When the two races met again, the Overlords would have won the trust and friendship of Mankind, and not even the shock of recognition could undo that work. They would go together into the future, and the unknown tragedy that had darkened the past would be lost forever down the dim corridors of prehistoric time.

And Stormgren knew also that the last thing he would ever see as he closed his eyes on life would be that swiftly turning door, and the long black tail disappearing behind it.

A very famous and unexpectedly beautiful tail.

A barbed tail.

BREAKING.

STRAIN.

"Breaking Strain" was written in the summer of 1948, and although its deliberately low-key treatment was neither thrilling nor wondrous, it appeared in Thrilling Wonder Stories Thrilling Wonder Stories for December 1949. (To justify his existence, the editor changed the t.i.tle to the unexciting and unimaginative "Thirty Seconds-Thirty Days." And to make matters even more confused, he later republished it in for December 1949. (To justify his existence, the editor changed the t.i.tle to the unexciting and unimaginative "Thirty Seconds-Thirty Days." And to make matters even more confused, he later republished it in The Best From Startling Stories.) The Best From Startling Stories.) The story caused one friendly critic to remark that I was apparently aspiring to the "Kipling of the s.p.a.ceways"-a n.o.ble but (at least in 1948)-somewhat premature ambition. And on going through my records I am Thrilled and Startled to see that it was sold to CBS in 1955. I wonder if it was ever used...

GRANT WAS WRITING UP the the Star Queen's Star Queen's log when he heard the cabin door opening behind him. He didn't bother to look around-it was hardly necessary for there was only one other man aboard the ship. But when nothing happened, and when McNeil neither spoke nor came into the room, the long silence finally roused Grant's curiosity and he swung the seat round in its gimbals. log when he heard the cabin door opening behind him. He didn't bother to look around-it was hardly necessary for there was only one other man aboard the ship. But when nothing happened, and when McNeil neither spoke nor came into the room, the long silence finally roused Grant's curiosity and he swung the seat round in its gimbals.

McNeil was just standing in the doorway, looking as if he had seen a ghost. The trite metaphor flashed into Grant's mind instantly. He did not know for a moment how near the truth it was. In a sense McNeil had had seen a ghost-the most terrifying of all ghosts-his own. seen a ghost-the most terrifying of all ghosts-his own.

"What's the matter?" said Grant angrily. "You sick or something?"

The engineer shook his head. Grant noticed the little beads of sweat that broke away from his forehead and went glittering across the room on their perfectly straight trajectories. His throat muscles moved, but for a while no sound came. It looked as though he was going to cry.

"We're done for," he whispered at last. "Oxygen reserve's gone."

Then he did cry. He looked like a flabby doll, slowly collapsing on itself. He couldn't fall, for there was no gravity, so he just folded up in mid-air.

Grant said nothing. Quite unconsciously he rammed his smoldering cigarette into the ash tray, grinding it viciously until the last tiny spark had died. Already the air seemed to be thickening around him as the oldest terror of the s.p.a.ceways gripped him by the throat.

He slowly loosed the elastic straps which, while he was seated, gave some illusion of weight, and with an automatic skill launched himself toward the doorway. McNeil did not offer to follow. Even making every allowance for the shock he had undergone, Grant felt that he was behaving very badly. He gave the engineer an angry cuff as he pa.s.sed and told him to snap out of it.

The hold was a large hemispherical room with a thick central column which carried the controls and cabling to the other half of the dumbbell-shaped s.p.a.ceship a hundred meters away. It was packed with crates and boxes arranged in a surrealistic three-dimensional array that made very few concessions to gravity.

But even if the cargo had suddenly vanished Grant would scarcely have noticed. He had eyes only for the big oxygen tank, taller than himself, which was bolted against the wall near the inner door of the airlock.

It was just as he had last seen it, gleaming with aluminum paint, and the metal sides still held the faint touch of coldness that gave the only hint of the contents. All the piping seemed in perfect condition. There was no sign of anything wrong apart from one minor detail. The needle of the contents gauge lay mutely against the zero stop.

Grant gazed at the silent symbol as a man in ancient London, returning home one evening at the time of the Plague, might have stared at a rough cross newly scrawled upon his door. Then he banged half a dozen times on the gla.s.s in the futile hope that the needle had stuck-though he never really doubted its message. News that is sufficiently bad somehow carries its own guarantee of truth. Only good reports need confirmation.

When Grant got back to the control room, McNeil was himself again. A glance at the opened medicine chest showed the reason for the engineer's rapid recovery. He even a.s.sayed a faint attempt at humor.

"It was a meteor," he said. "They tell us a ship this size should get hit once a century. We seem to have jumped the gun with ninety-five years still to go."

"But what about the alarms? The air pressure's normal-how could we have been holed?"

"We weren't," McNeil replied. "You know how the oxygen circulates night-side through the refrigerating coils to keep it liquid? The meteor must have smashed them and the stuff simply boiled away."

Grant was silent, collecting his thoughts. What had happened was serious-deadly serious-but it need not be fatal. After all, the voyage was more than three quarters over.

"Surely the regenerator can keep the air breathable, even if it does get pretty thick?" he asked hopefully.

McNeil shook his head. "I've not worked it out in detail, but I know the answer. When the carbon dioxide is broken down and the free oxygen gets cycled back there's a loss of about ten percent. That's why we have to carry a reserve."

"The s.p.a.ce suits!" cried Grant in sudden excitement. "What about their tanks?"

He had spoken without thinking, and the immediate realization of his mistake left him feeling worse than before.

"We can't keep oxygen in them-it would boil off in a few days. There's enough compressed gas there for about thirty minutes-merely long enough for you to get to the main tank in an emergency."

"There must be a way out-even if we have to jettison cargo and run for it. Let's stop guessing and work out exactly where we are."

Grant was as much angry as frightened. He was angry with McNeil for breaking down. He was angry with the designers of the ship for not having foreseen this G.o.d-knew-how-many-million-to-one chance. The deadline might be a couple of weeks away and a lot could happen before then. The thought helped for a moment to keep his fears at arm's length.

This was an emergency, beyond doubt, but it was one of those peculiarly protracted emergencies that seem to happen only in s.p.a.ce. There was plenty of time to think-perhaps too much time.

Grant strapped himself in the pilot's seat and pulled out a writing-pad.

"Let's get the facts right," he said with artificial calmness. "We've got the air that's still circulating in the ship and we lose ten percent of the oxygen every time it goes through the generator. Chuck me over the Manual, will you? I can never remember how many cubic meters we use a day."

In saying that the Star Queen Star Queen might expect to be hit by a meteor once every century, McNeil had grossly but unavoidably oversimplified the problem. For the answer depended on so many factors that three generations of statisticians had done little but lay down rules so vague that the insurance companies still shivered with apprehension when the great meteor showers went sweeping like a gale through the orbits of the inner worlds. might expect to be hit by a meteor once every century, McNeil had grossly but unavoidably oversimplified the problem. For the answer depended on so many factors that three generations of statisticians had done little but lay down rules so vague that the insurance companies still shivered with apprehension when the great meteor showers went sweeping like a gale through the orbits of the inner worlds.

Everything depends, of course, on what one means by the word meteor. Each lump of cosmic slag that reaches the surface of the Earth has a million smaller brethren that perish utterly in the no-man's-land where the atmosphere has not quite ended and s.p.a.ce has yet to begin-that ghostly region where the weird Aurora sometimes walks by night.

These are the familiar shooting stars, seldom larger than a pin's head, and these in turn are outnumbered a millionfold again by particles too small to leave any visible trace of their dying as they drift down from the sky. All of them, the countless specks of dust, the rare boulders and even the wandering mountains that Earth encounters perhaps once every million years-all of them are meteors.

For the purposes of s.p.a.ce-flight, a meteor is only of interest if, on penetrating the hull of a ship, it leaves a hole large enough to be dangerous. This is a matter of relative speeds as well as size. Tables have been prepared showing approximate collision times for various parts of the Solar System-and for various sizes of meteors down to ma.s.ses of a few milligrams.

That which had struck the Star Queen Star Queen was a giant, being nearly a centimeter across and weighing all of ten grams. According to the table the waiting-time for collision with such a monster was of the order of ten to the ninth days-say three million years. The virtual certainty that such an occurrence would not happen again in the course of human history gave Grant and McNeil very little consolation. was a giant, being nearly a centimeter across and weighing all of ten grams. According to the table the waiting-time for collision with such a monster was of the order of ten to the ninth days-say three million years. The virtual certainty that such an occurrence would not happen again in the course of human history gave Grant and McNeil very little consolation.

However, things might have been worse. The Star Queen Star Queen was 115 days on her orbit and had only thirty still to go. She was traveling, as did all freighters, on the long tangential ellipse kissing the orbits of Earth and Venus on opposite sides of the Sun. The fast liners could cut across from planet to planet at three times her speed-and ten times her fuel consumption-but she must plod along her predetermined track like a streetcar, taking 145 days, more or less, for each journey. was 115 days on her orbit and had only thirty still to go. She was traveling, as did all freighters, on the long tangential ellipse kissing the orbits of Earth and Venus on opposite sides of the Sun. The fast liners could cut across from planet to planet at three times her speed-and ten times her fuel consumption-but she must plod along her predetermined track like a streetcar, taking 145 days, more or less, for each journey.

Anything more unlike the early-twentieth-century idea of a s.p.a.ceship than the Star Queen Star Queen would be hard to imagine. She consisted of two spheres, one fifty and the other twenty meters in diameter, joined by a cylinder about a hundred meters long. The whole structure looked like a match-stick-and-Plasticine model of a hydrogen atom. Crew, cargo, and controls were in the larger sphere, while the smaller one held the atomic motors and was-to put it mildly-out of bounds to living matter. would be hard to imagine. She consisted of two spheres, one fifty and the other twenty meters in diameter, joined by a cylinder about a hundred meters long. The whole structure looked like a match-stick-and-Plasticine model of a hydrogen atom. Crew, cargo, and controls were in the larger sphere, while the smaller one held the atomic motors and was-to put it mildly-out of bounds to living matter.

The Star Queen Star Queen had been built in s.p.a.ce and could never have lifted herself even from the surface of the Moon. Under full power her ion drive could produce an acceleration of a twentieth of a gravity, which in an hour would give her all the velocity she needed to change from a satellite of the Earth to one of Venus. had been built in s.p.a.ce and could never have lifted herself even from the surface of the Moon. Under full power her ion drive could produce an acceleration of a twentieth of a gravity, which in an hour would give her all the velocity she needed to change from a satellite of the Earth to one of Venus.

Hauling cargo up from the planets was the job of the powerful little chemical rockets. In a month the tugs would be climbing up from Venus to meet her, but the Star Queen Star Queen would not be stopping for there would be no one at the controls. She would continue blindly on her orbit, speeding past Venus at miles a second-and five months later she would be back at the orbit of the Earth, though Earth itself would then be far away. would not be stopping for there would be no one at the controls. She would continue blindly on her orbit, speeding past Venus at miles a second-and five months later she would be back at the orbit of the Earth, though Earth itself would then be far away.

It is surprising how long it takes to do a simple addition when your life depends on the answer. Grant ran down the short column of figures half a dozen times before he finally gave up hope that the total would change. Then he sat doodling nervously on the white plastic of the pilot's desk.

"With all possible economies," he said, "we can last about twenty days. That means we'll be ten days out of Venus when..." His voice trailed off into silence.

Ten days didn't sound much-but it might just as well have been ten years. Grant thought sardonically of all the hack adventure writers who had used just this situation in their stories and radio serials. In these circ.u.mstances, according to the carbon-copy experts-few of whom had ever gone beyond the Moon-there were three things that could happen.

The popular solution-which had become almost a cliche-was to turn the ship into a glorified greenhouse or a hydroponic farm and let photosynthesis do the rest. Alternatively one could perform prodigies of chemical or atomic engineering-explained in tedious technical detail-and build an oxygen manufacturing plant which would not only save your life-and of course the heroine's-but also make you the owner of fabulously valuable patents. The third or deus ex machina deus ex machina solution was the arrival of a convenient s.p.a.ceship which happened to be matching your course and velocity exactly. solution was the arrival of a convenient s.p.a.ceship which happened to be matching your course and velocity exactly.

But that was fiction and things were different in real life. Although the first idea was sound in theory there wasn't even a packet of gra.s.s seed aboard the Star Queen Star Queen. As for feats of inventive engineering, two men-however brilliant and however desperate-were not likely to improve in a few days on the work of scores of great industrial research organizations over a full century.

The s.p.a.ceship that "happened to be pa.s.sing" was almost, by definition, impossible. Even if other freighters had been coasting on the same elliptic path-and Grant knew there were none-then by the very laws that governed their movements they would always keep their original separations. It was not quite impossible that a liner, racing on its hyperbolic orbit, might pa.s.s within a few hundred thousand kilometers of them-but at a speed so great that it would be as inaccessible as Pluto.

"If we threw out the cargo," said McNeil at last, "would we have a chance of changing our orbit?"

Grant shook his head.

"I'd hoped so," he replied, "but it won't work. We could reach Venus in a week if we wished-but we'd have no fuel for braking and nothing from the planet could catch us as we went past."

"Not even a liner?"

"According to Lloyd's Register Lloyd's Register Venus has only a couple of freighters at the moment. In any case it would be a practically impossible maneuver. Even if it could match our speed how would the rescue ship get back? It would need about fifty kilometers a second for the whole job!" Venus has only a couple of freighters at the moment. In any case it would be a practically impossible maneuver. Even if it could match our speed how would the rescue ship get back? It would need about fifty kilometers a second for the whole job!"

"If we can't figure a way out," said McNeil, "maybe someone on Venus can. We'd better talk to them."

"I'm going to," Grant replied, "as soon as I've decided what to say. Go and get the transmitter aligned, will you?"

He watched McNeil as he floated out of the room. The engineer was probably going to give trouble in the days that lay ahead. Until now they had got on well enough-like most stout men McNeil was good-natured and easy going. But now Grant realized that he lacked fiber. He had become flabby-physically and mentally-living too long in s.p.a.ce.

A buzzer sounded on the transmitter switchboard. The parabolic mirror out on the hull was aimed at the gleaming arc-lamp of Venus, only ten million kilometers away and moving on an almost parallel path. The three-millimeter waves from the ship's transmitter would make the trip in little more than half a minute. There was bitterness in the knowledge that they were only thirty seconds from safety.

The automatic monitor on Venus gave its impersonal Go ahead Go ahead signal and Grant began to talk steadily, and he hoped, quite dispa.s.sionately. He gave a careful a.n.a.lysis of the situation and ended with a request for advice. His fears concerning McNeil he left unspoken. For one thing he knew that the engineer would be monitoring him at the transmitter. signal and Grant began to talk steadily, and he hoped, quite dispa.s.sionately. He gave a careful a.n.a.lysis of the situation and ended with a request for advice. His fears concerning McNeil he left unspoken. For one thing he knew that the engineer would be monitoring him at the transmitter.

As yet no one on Venus would have heard the message, even though the transmission time-lag was over. It would still be coiled up in the recorder spools, but in a few minutes an unsuspecting signal officer would arrive to play it over.

He would have no idea of the bombsh.e.l.l that was about to burst, triggering trains of sympathetic ripples on all the inhabited worlds as television and newssheet took up the refrain. An accident in s.p.a.ce has a dramatic quality that crowds all other items from the headlines.

Until now Grant had been too preoccupied with his own safety to give much thought to the cargo in his charge. A sea captain of ancient times, whose first thought was for his ship, might have been shocked by the att.i.tude. Grant, however, had reason on his side.

The Star Queen Star Queen could never founder, could never run upon uncharted rocks or pa.s.s silently, as so many ships have pa.s.sed, forever from the knowledge of man. She was safe, whatever might befall her crew. If she was undisturbed she would continue to retrace her orbit with such precision that men might set their calendars by her for centuries to come. could never founder, could never run upon uncharted rocks or pa.s.s silently, as so many ships have pa.s.sed, forever from the knowledge of man. She was safe, whatever might befall her crew. If she was undisturbed she would continue to retrace her orbit with such precision that men might set their calendars by her for centuries to come.

The cargo, Grant suddenly remembered, was insured for over twenty million dollars. There were not many goods valuable enough to be shipped from world to world and most of the crates in the hold were worth more than their weight-or rather their ma.s.s-in gold. Perhaps some items might be useful in this emergency and Grant went to the safe to find the loading schedule.

He was sorting the thin, tough sheets when McNeil came back into the cabin.

"I've been reducing the air pressure," he said. "The hull shows some leaks that wouldn't have mattered in the usual way."

Grant nodded absently as he pa.s.sed a bundle of sheets over to McNeil.

"Here's our loading schedule. I suggest we both run through it in case there's anything in the cargo that may help."

If it did nothing else, he might have added, it would at least give them something to occupy their minds.

As he ran down the long columns of numbered items-a complete cross-section of interplanetary commerce-Grant found himself wondering what lay behind these inanimate symbols. Item 347-1 book-4 kilos gross Item 347-1 book-4 kilos gross.

He whistled as he noticed that it was a starred item, insured for a hundred thousand dollars, and he suddenly remembered hearing on the radio that the Hesperian Museum had just bought a first edition Seven Pillars of Wisdom Seven Pillars of Wisdom.

A few sheets later was a very contrasting item, Miscellaneous books-25 kilos-no intrinsic value Miscellaneous books-25 kilos-no intrinsic value.

It had cost a small fortune to ship those books to Venus, yet they were of "no intrinsic value." Grant let his imagination loose on the problem. Perhaps someone who was leaving Earth forever was taking with him to a new world his most cherished treasures-the dozen or so volumes that above all others had most shaped his mind.

Item 564-12 reels film.

That, of course, would be the Neronian super-epic, While Rome Burns While Rome Burns, which had left Earth just one jump ahead of the censor. Venus was waiting for it with considerable impatience.

Medical supplies-50 kilos. Case of cigars-1 kilo. Precision instruments-75 kilos. So the list went on. Each item was something rare or something which the industry and science of a younger civilization could not yet produce.

The cargo was sharply divided into two cla.s.ses-blatant luxury or sheer necessity. There was little in between. And there was nothing, nothing at all, which gave Grant the slightest hope. He did not see how it could have been otherwise, but that did not prevent him from feeling a quite unreasonable disappointment.

The reply from Venus, when it came at last, took nearly an hour to run through the recorder. It was a questionnaire so detailed that Grant wondered morosely if he'd live long enough to answer it. Most of the queries were technical ones concerning the ship. The experts on two planets were pooling their brains in the attempt to save the Star Queen Star Queen and her cargo. and her cargo.

"Well, what do you think of it?" Grant asked McNeil when the other had finished running through the message. He was watching the engineer carefully for any further sign of strain.

There was a long pause before McNeil spoke. Then he shrugged his shoulders and his first words were an echo of Grant's own thoughts.

"It will certainly keep us busy. I won't be able to do all these tests in under a day. I can see what they're driving at most of the time, but some of the questions are just plain crazy."

Grant had suspected that, but said nothing as the other continued.

"Rate of hull leakage-that's sensible enough, but why should anyone want to know the efficiency of our radiation screening? I think they're trying to keep up our morale by pretending they have some bright ideas-or else they want to keep us too busy to worry."

Grant was relieved and yet annoyed by McNeil's calmness-relieved because he had been afraid of another scene and annoyed because McNeil was not fitting at all neatly into the mental category he had prepared for him. Was that first momentary lapse typical of the man or might it have happened to anyone?

Grant, to whom the world was very much a place of blacks and whites, felt angry at being unable to decide whether McNeil was cowardly or courageous. That he might be both was a possibility that never occurred to him.

There is a timelessness about s.p.a.ce-flight that is unmatched by any other experience of man. Even on the Moon there are shadows that creep sluggishly from crag to crag as the sun makes its slow march across the sky. Earthward there is always the great clock of the spinning globe, marking the hours with continents for hands. But on a long voyage in a gyro-stabilized ship the same patterns of sunlight lie unmoving on wall or floor as the chronometer ticks off its meaningless hours and days.