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  "I'm telling you all this because it will increase your con­fidence to know what is going on. What you're going to do now is to flush out your lungs and fill your system with oxygen. It's called hyperventilation, which is simply a ten dollar word for deep breathing. When I give the signal, I want you all to breathe as deeply as you can, then exhale completely, and carry on breathing in the same way until I tell you to stop. I'll let you do it for a minute; some of you may feel a bit dizzy at the end of that time, but it'll pass. Take in all the air you can with every breath; swing your arms to get maximum chest expansion.

  "Then, when the minute's up, I'll tell you to exhale, then stop breathing, and I'll begin counting seconds again. I think I can promise you a big surprise. O.K.—here we go!"

  For the next minutes, the overcrowded compartments of the Acheron presented a fantastic spectacle. More than a hundred men were flailing their arms and breathing stertorously, as if each was at his last gasp. Some were too closely packed together to breathe as deeply as they would have liked, and all had to anchor themselves somehow so that their exertion would not cause them to drift around the cabins.

  "Now!" shouted the M.O. "Stop breathing—blow out all your air—and see how long you can manage before you've got to start again. I'll count the seconds, but this time I won't begin until half a minute has gone."

  The result, it was obvious, left everyone flabbergasted. One man failed to make the minute, otherwise almost two minutes elapsed before most of the men felt the need to breathe again. Indeed, to have taken a breath before then would have de­manded a deliberate effort. Some men were still perfectly com­fortable after three or four minutes; one was holding out at five when the doctor stopped him.

  "I think you'll all see what I was trying to prove. When your lungs are flushed out with oxygen, you just don't want to breathe for several minutes, any more than you want to eat again after a heavy meal. It's no strain or hardship; it's not a question of holding your breath. And if your life depended on it, you could do even better than this, I promise you.

  "Now we're going to tie up right alongside the Pegasus; it will take less than thirty seconds to get over to her. She'll have

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  her men out in suits to push along any stragglers, and the air lock doors will be slammed shut as soon as you're all inside. Then the lock will be flooded with air and you'll be none the worse except for some bleeding noses."

  He hoped that was true. There was only one way to find out. It was a dangerous and unprecedented gamble, but there was no alternative. At least it would give every man a fighting chance for his life.

  "Now," he continued, "you're probably wondering about the pressure drop. That's the only uncomfortable part, but you won't be in a vacuum long enough for severe damage. We'll open the hatches in two stages; first we'll drop pressure slowly to a tenth of an atmosphere, then we'll blow out completely in one bang and make a dash for it. Total decompression's pain­ful, but not dangerous. Forget all that nonsense you may have heard about the human body blowing up in a vacuum. We're a lot tougher than that, and the final drop we're going to make from a tenth of an atmosphere to zero is considerably less than men have already stood in lab tests. Hold your mouth wide open and let yourself break wind. You'll feel your skin stinging all over, but you'll probably be too busy to notice that."

  The M.O. paused, and surveyed his quiet, intent audience. They were all taking it very well, but that was only to be ex­pected. Every one was a trained man—they were the pick of the planets' engineers and technicians.

  "As a matter of fact," the surgeon continued cheerfully, "you'll probably laugh when I tell you the biggest danger of the lot. It's nothing more than sunburn. Out there you'll be in the sun's raw ultra-violet, unshielded by atmosphere. It can give you a nasty blister in thirty seconds, so we'll make the crossing in the shadow of the Pegasus. If you happen to get outside that shadow, just shield your face with your arm. Those of you who've got gloves might as well wear them.

  "Well, that's the picture. I'm going to cross with the first team just to show how easy it is. Now I want you to split up into four groups, and I'll drill you each separately."

  Side by side, the Pegasus and the Acheron raced toward the distant planet that only one of them would ever reach. The

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  airlocks of the liner were open, gaping wide no more than a few meters from the hull of the crippled battleship. The space between the two vessels was strung with guide ropes, and among them floated the men of the liner's crew, ready to give assistance if any of the escaping men were overcome during the brief but dangerous crossing.

  It was lucky for the crew of the Acheron that four pressure bulkheads were still intact. Their ship could still be divided into four separate compartments, so that a quarter of the crew could leave at a time. The airlocks of the Pegasus could not have held everyone at once if a mass escape had been neces­sary.

  Captain Halstead watched from the bridge as the signal was given. There was a sudden puff of smoke from the hull of the battleship, then the emergency hatch—certainly never designed for an emergency such as this—blew away into space. A cloud of dust and condensing vapor blasted out, obscuring the view for a second. He knew how the waiting men would feel the escaping air sucking at their bodies, trying to tear them away from their handholds.

  When the cloud had dispersed, the first men had already emerged. The leader was wearing a spacesuit, and all the others were strung on the three lines attached to him. Instantly, men from the Pegasus grabbed two of the lines and darted off to their respective airlocks. The men of the Acheron, Halstead was relieved to see, all appeared to be conscious and to be doing everything they could to help.

  It seemed ages before the last figure on its drifting line was towed or pushed into an airlock. Then the voice from one of those spacesuited figures out there shouted, "Close Number Three!" Number One followed almost at once; but there was an agonizing delay before the signal for Two came. Halstead could not see what was happening; presumably someone was still out­side and holding up the rest. But at last all the locks were closed. There was no time to fill them in the normal way; the valves were jerked open by brute force and the chambers flood­ed with air from the ship.

  Aboard the Acheron, Commodore Brennan waited with his remaining ninety men, in the three compartments that were still

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  unsealed. They had formed their groups and were strung in chains of ten behind their leaders. Everything had been planned and rehearsed; the next few seconds would prove whether or not in vain.

  Then the ship's speakers announced, in an almost quietly conversational tone:

  "Pegasus to Acheron. We've got all your men out of the locks. No casualties. A few hemorrhages. Give us five minutes to get ready for the next batch."

  They lost one man on the last transfer. He panicked and they had to slam the lock shut without him, rather than risk the lives of all the others. It seemed a pity that they could not all have made it, but for the moment everyone was too thankful to worry about that.

  There was only one thing still to be done. Commodore Bren-nan, the last man aboard the Acheron, adjusted the timing circuit that would start the drive in thirty seconds. That would give him long enough; even in his clumsy spacesuit he could get out of the open hatch in half that time. It was cutting it fine, but on!y he and his engineering officer knew how narrow the margin was.

  He threw the switch and dived for the hatch. He had already reached the Pegasus when the ship he had commanded, still loaded with millions of kilowatt-centuries of energy, came to life for the last time and dwindled silently toward the stars of the Milky Way.

  The explosion was easily visible among all the inner planets. It blew to nothingness the last ambitions of the Federation, and the last fears of Earth.

  Chapter XX

  every evening, as the sun drops down beyond the lonely pyramid of Pico, the shadow of the great mountain reaches out to engulf the meta
l column that will stand in the Sea of Rains as long as the Sea itself endures. There are five hundred and twenty-seven names on that column, in alphabetical order. No

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  mark distinguishes the men who died for the Federation from those who died for Earth, and perhaps this simple fact is the best proof that they did not die in vain.

  The Battle of Pico ended the domination of Earth and marked the coming of age of the planets. Earth was weary after her long saga and the efforts she had put forth to conquer the nearer worlds—those worlds which had now so inexplicably turned against her, as long ago the American colonies had turned against their motherland. In both cases the reasons were similar, and in both the eventual outcomes equally advantageous to mankind.

  Had either side won a clearcut victory, it might have been a disaster. The Federation might have been tempted to impose on Earth an agreement which it could never enforce. Earth, on the other hand, might well have crippled its errant children by withdrawing all supplies, thus setting back for centuries the colonization of the planets.

  Instead, it had been a stalemate. Each antagonist had learned a sharp and salutary lesson; above all, each had learned to re­spect the other. And each was now very busy explaining to its citizens exactly what it had been doing in their names. . . .

  The last explosion of the war was followed, within a few hours, by political explosions on Earth, Mars and Venus. When the smoke had drifted away, many ambitious personalities had disappeared, at least for the time being, and those in power had one main objective—to re-establish friendly relations, and to erase the memory of an episode which did credit to no one.

  The Pegasus incident, cutting across the divisions of war and reminding men of their essential unity, made the task of the statesmen far easier than it might otherwise have been. The Treaty of Phobos was signed in what one historian called an atmosphere of shamefaced conciliation. Agreement was swift, for Earth and Federation each possessed something that the other needed badly.

  The superior science of the Federation had given it the secret of the accelerationless drive, as it is now universally but inaccu­rately called. For its part, Earth was now prepared to share the wealth she had tapped far down within the Moon. The barren crust had been penetrated, and at last the heavy core was yielding

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  up its stubbornly guarded treasures. There was wealth here that would supply all man's needs for centuries to come.

  It was destined, in the years ahead, to transform the solar system and to alter completely the distribution of the human race. Its immediate effect was to make the Moon, long the poor relation of the old and wealthy Earth, into the richest and most important of all the worlds. Within ten years, the Independent Lunar Republic would be dictating F.O.B. terms to Earth and Federation with equal impartiality.

  But the future would take care of itself. All that mattered now was that the war was over.

  Chapter XXI

  central city, thought Sadler, had grown since he was here thirty years ago. Any one of these domes could cover the whole seven they had back in the old days. How long would it be, at this rate, before the whole Moon was covered up? He rather hoped it would not be in his time.

  The station itself was almost as large as one of the old domes. Where there had been five tracks, there were now thirty. But the design of the monocabs had not altered much, and their speed seemed to be about the same. The vehicle which had brought him from the spaceport might well have been the one that had carried him across the Sea of Rains a quarter of a lifetime ago.

  A quarter of a lifetime, that is, if you were a citizen of the Moon and could expect to see your one hundred and twentieth birthday. But a full third of a lifetime if you spent all your waking and sleeping hours fighting the gravity of Earth. . . .

  There were far more vehicles in the streets; Central City was too big to operate on a pedestrian basis now. But one thing had not changed. Overhead was the blue, cloud-flecked sky of Earth, and Sadler did not doubt that the rain still came on schedule.

  He jumped into an autocab and dialed the address, relaxing as he was carried through the busy streets. His baggage had al­ready gone to the hotel, and he was in no hurry to follow it. As soon as he arrived there, business would catch up with him

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  again, and he might not have another chance of carrying out this mission.

  There seemed almost as many businessmen and tourists from Earth here as there were residents. It was easy to distinguish them, not only by their clothes and behavior but by the way they walked in this low gravity. Sadler was surprised to find that though he had been on the Moon only a few hours, the auto­matic muscular adjustment he had learned so long ago came smoothly into play again. It was like learning to ride a bicycle; once you had achieved it, you never forgot.

  So they had a lake here now, complete with islands and swans. He had read about the swans; their wings had to be carefully clipped to prevent their flying away and smashing into the "sky." There was a sudden splash as a large fish broke the sur­face; Sadler wondered if it was surprised to find how high it could jump out of the water.

  The cab, threading its way above the buried guide-rods, swooped down a tunnel that must lead beneath the edge of the dome. Because the illusion of sky was so well contrived, it was not easy to tell when you were about to leave one dome and enter another, but Sadler knew where he was when the vehicle went past the great metal doors at the lowest part of the tube. These doors, so he had been told, could smash shut in less than two seconds, and would do so automatically if there was a pres­sure drop on either side. Did such thoughts as these, he won­dered, ever give sleepless nights to the inhabitants of Central City? He very much doubted it; a considerable fraction of the human race had spent its life in the shadow of volcanoes, dams and dykes, without developing any signs of nervous tension. Only once had one of the domes of Central City been evacuated —in both senses of the word—and that was due to a slow leak that had taken hours to be effective.

  The cab rose out of the tunnel into the residential area, and Sadler was faced with a complete change of scenery. This was no dome encasing a small city; this was a single giant building in itself, with moving corridors instead of streets. The cab came to a halt, and reminded him in polite tones that it would wait thirty minutes for an extra one-fifty. Sadler, who thought it might take him that length of time even to find the place he was

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  looking for, declined the offer and the cab pulled away in search of fresh customers.

  There was a large bulletin board a few meters away, display­ing a three-dimensional map of the building. The whole place reminded Sadler of a type of beehive used many centuries ago, which he had once seen illustrated in an old encyclopedia. No doubt it was absurdly easy to find your way around when you'd got used to it, but for the moment he was quite baffled by Floors, Corridors. Zones and Sectors.

  "Going somewhere, mister?" said a small voice behind him.

  Sadler turned round, and saw a boy of six or seven years look­ing at him with alert, intelligent eyes. He was just about the same age as Jonathan Peter II. Lord, it had been a long time since he last visited the Moon. . . .

  "Don't often see Earth folk here," said the youngster. "You lost?"

  "Not yet," Sadler replied. "But I suspect I soon will be."

  "Where going?"

  If there was a "you" in that sentence, Sadler missed it. It was really astonishing that, despite the interplanetary radio net­works, distinct differences of speech were springing up on the various worlds. This boy could doubtless speak perfectly good Earth-English when he wanted to, but it was not his language of everyday communication.

  Sadler looked at the rather complex address in his notebook, and read it out slowly.

  "Come on," said his self-appointed guide. Sadler gladly obeyed.

  The ramp ahead ended abruptly in a broad, slowly moving roller-road. This carried them forward a few meters, then de­canted them on to a high-s
peed section. After sweeping at least a kilometer past the entrances to countless corridors, they were switched back on to a slow section and carried to a huge, hexag­onal concourse. It was crowded with people, coming and going from one roadway to another, and pausing to make purchases at little kiosks. Rising through the center of the busy scene were two spiral ramps, one carrying the up and the other the down traffic. They stepped on to the "Up" spiral and let the moving surface lift them half a dozen floors. Standing at the edge of the