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  Among his minor accomplishments was a talent now rare, though many thought not rare enough—the art of whistling. With or without encouragement he could reproduce the themes from most of the movies of the last two hundred years. He started appropriately with Heigh-ho, heigh-ho, 'tis off to work we go, found that he couldn't stay down comfortably in the bass with Disney's marching dwarfs, and switched quickly to the River Kwai song. Then he progressed, more or less chronologically, through half a dozen epics, culminating with the theme from Sid Krassman's famous late-twentieth-century "Napoleon".

  It was a good try, but it didn't work, even as a morale-builder. Rama needed the grandeur of Bach or Beethoven or Sibelius or Tuan Sun, not the trivia of popular entertainment. Norton was on the point of suggesting that Joe save his breath for later exertions, when the young officer realized the inappropriateness of his efforts. Thereafter, apart from an occasional consultation with the ship, they marched on in silence. Rama had won this round.

  On his initial traverse, Norton had allowed for one detour. Paris lay straight ahead, halfway between the foot of the stairway and the shore of the Cylindrical Sea, but only a kilometre to the right of their track was a very prominent, and rather mysterious, feature which had been christened the Straight Valley. It was a long groove or trench, forty metres deep and a hundred wide, with gently sloping sides; it had been provisionally identified as an irrigation ditch or canal. Like the stairway itself, it had two similar counterparts, equally spaced around the curve of Rama.

  The three valleys were almost ten kilometres long, and stopped abruptly just before they reached the Sea—which was strange, if they were intended to carry water. And on the other side of the Sea the pattern was repeated: three more ten-kilometre trenches continued on to the South Polar region.

  They reached the end of the Straight Valley after only fifteen minutes' comfortable walking, and stood for a while staring thoughtfully into its depths. The perfectly smooth walls sloped down at an angle of sixty degrees; there were no steps or footholds. Filling the bottom was a sheet of flat, white material that looked very much like ice. A specimen could settle a good many arguments; Norton decided to get one.

  With Calvert and Rodrigo acting as anchors and paying out a safety rope, he rappelled slowly down the steep incline. When he reached the bottom, he fully expected to find the familiar slippery feel of ice underfoot, but he was mistaken. The friction was too great; his footing was secure. This material was some kind of glass or transparent crystal; when he touched it with his fingertips, it was cold, hard and unyielding.

  Turning his back to the searchlight and shielding his eyes from its glare. Norton tried to peer into the crystalline depths, as one may attempt to gaze through the ice of a frozen lake. But he could see nothing; even when he tried the concentrated beam of his own helmet-lamp he was no more successful. This stuff was translucent, but not transparent. If it was a frozen liquid, it had a melting point very much higher than water.

  He tapped it gently with the hammer from his geology kit; the tool rebounded with a dull, unmusical 'dunk'. He tapped harder, with no more result, and was about to exert his full strength when some impulse made him desist.

  It seemed most unlikely that he could crack this material; but what if he did? He would be like a vandal, smashing some enormous plate-glass window. There would be a better opportunity later, and at least he had discovered valuable information. It now seemed more unlikely than ever that this was a canal; it was simply a peculiar trench that stopped and started abruptly, but led nowhere. And if at any time it had carried liquid, where were the stains, the encrustations of dried-up sediment that one would expect? Everything was bright and clean, as if the builders had left only yesterday…

  Once again he was face to face with the fundamental mystery of Rama, and this time it was impossible to evade it. Commander Norton was a reasonably imaginative man, but he would never have reached his present position if he had been liable to the wilder flights of fancy. Yet now, for the first time, he had a sense—not exactly of foreboding, but of anticipation. Things were not what they seemed; there was something very, very odd about a place that was simultaneously brand new—and a million years old.

  Very thoughtfully, he began to walk slowly along the length of the little valley, while his companions, still holding the rope that was attached to his waist, followed him along the rim. He did not expect to make any further discoveries, but he wanted to let his curious emotional state run its course. For something else was worrying him; and it had nothing to do with the inexplicable newness of Rama.

  He had walked no more than a dozen metres when it hit him like a thunderbolt.

  He knew this place. He had been here before.

  Even on Earth, or some familiar planet, that experience is disquieting, though it is not particularly rare. Most men have known it at some time or other, and usually they dismiss it as the memory of a forgotten photograph, a pure coincidence—or, if they are mystically inclined, some form of telepathy from another mind, or even a flashback from their own future.

  But to recognize a spot which no other human being can possibly have seen—that is quite shocking. For several seconds, Commander Norton stood rooted to the smooth crystalline surface on which he had been walking, trying to straighten out his emotions. His well-ordered universe had been turned upside down, and he had a dizzying glimpse of those mysteries at the edge of existence which he had successfully ignored for most of his life.

  Then, to his immense relief, common sense came to the rescue. The disturbing sensation of déjà-vu faded out, to be replaced by a real and identifiable memory from his youth.

  It was true—he had once stood between such steeply sloping walls, watching them drive into the distance until they seemed to converge at a point indefinitely far ahead. But they had been covered with neatly trimmed grass; and underfoot had been broken stone, not smooth crystal.

  It had happened thirty years ago, during a summer vacation in England. Largely because of another student (he could remember her face—but he had forgotten her name) he had taken a course of industrial archaeology, then very popular among science and engineering graduates. They had explored abandoned coal-mines and cotton mills, climbed over ruined blast-furnaces and steam engines, goggled unbelievingly at primitive (and still dangerous) nuclear reactors, and driven priceless turbine-powered antiques along restored motor roads.

  Not everything that they saw was genuine; much had been lost during the centuries, for men seldom bother to preserve the commonplace articles of everyday life. But where it was necessary to make copies, they had been reconstructed with loving care.

  And so young Bill Norton had found himself bowling along, at an exhilarating hundred kilometres an hour, while he furiously shovelled precious coal into the firebox of a locomotive that looked two hundred years old, but was actually younger than he was. The thirty-kilometre stretch of the Great Western Railway, however, was quite genuine, though it had required a good deal of excavating to get it back into commission.

  Whistle screaming, they had plunged into a hillside and raced through a smoky, flame-lit darkness. An astonishingly long time later, they had burst out of the tunnel into a deep, perfectly straight cutting between steep grassy banks. The long-forgotten vista was almost identical with the one before him now.

  'What is it, Skipper?' called Lt. Rodrigo. 'Have you found something?'

  As Norton dragged himself back to present reality, some of the oppression lifted from his mind. There was mystery here—yes; but it might not be beyond human understanding. He had learned a lesson, though it was not one that he could readily impart to others. At all costs, he must not let Rama overwhelm him. That way lay failure—perhaps even madness.

  'No,' he answered, 'there's nothing down here. Haul me up—we'll head straight to Paris.'

  CHAPTER 14

  STORM WARNING

  'I'VE CALLED THIS meeting of the Committee,' said His Excellency the Ambassador of Mars to the United Plane
ts, 'because Dr. Perera has something important to tell us. He insists that we get in touch with Commander Norton right away, using the priority channel we've been able to establish after, I might say, a good deal of difficulty. Dr. Perera's statement is rather technical, and before we come to it I think a summary of the present position might be in order; Dr. Price has prepared one. Oh yes—some apologies for absence. Sir Lewis Sands is unable to be with us because he's chairing a conference, and Dr. Taylor asks to be excused?'

  He was rather pleased about that last abstention. The anthropologist had rapidly lost interest in Rama, when it became obvious that it would present little scope for him. Like many others, he had been bitterly disappointed to find that the mobile worldlet was dead; now there would be no opportunity for sensational books and viddies about Raman rituals and behavioural patterns. Others might dig up skeletons and classify artifacts; that sort of thing did not appeal to Conrad Taylor. Perhaps the only discovery that would bring him back in a hurry would be some highly explicit works of art, like the notorious frescoes of Thera and Pompeii.

  Thelma Price, the archaeologist, took exactly the opposite point of view. She preferred excavations and ruins uncluttered by inhabitants who might interfere with dispassionate, scientific studies. The bed of the Mediterranean had been ideal—at least until the city planners and landscape artists had started getting in the way. And Rama would have been perfect, except for the maddening detail that it was a hundred million kilometres away and she would never be able to visit it in person.

  'As you all know,' she began, 'Commander Norton has completed one traverse of almost thirty kilometres, without encountering any problems. He explored the curious trench shown on your maps as the Straight Valley; its purpose is still quite unknown, but it's clearly important as it runs the full length of Rama—except for the break at the Cylindrical Sea—and there are two other identical structures 120 degrees apart round the circumference of the world.'

  'Then the party turned left—or East, if we adopt the North Pole convention—until they reached Paris. As you'll see from this photograph, taken by a telescope camera at the Hub, it's a group of several hundred buildings, with wide streets between them.'

  'Now these photographs were taken by Commander Norton's group when they reached the site. If Paris is a city, it's a very peculiar one. Note that none of the buildings have windows, or even doors! They are all plain rectangular structures, an identical thirty-five metres high. And they appear to have been extruded out of the ground—there are no seams or joints—look at this close-up of the base of a wall—there's a smooth transition into the ground.'

  'My own feeling is that this place is not a residential area, but a storage or supply depot. In support of that theory, look at this photo.'

  'These narrow slots or grooves, about five centimetres wide, run along all the streets, and there's one leading to every building—going straight into the wall. There's a striking resemblance to the streetcar tracks of the early twentieth century; they are obviously part of some transport system.'

  'We've never considered it necessary to have public transport direct to every house. It would be economically absurd—people can always walk a few hundred metres. But if these buildings are used for the storage of heavy materials, it would make sense.'

  'May I ask a question?' said the Ambassador for Earth.

  'Of course, Sir Robert.'

  'Commander Norton couldn't get into a single building?'

  'No; when you listen to his report, you can tell he was quite frustrated. At one time he decided that the buildings could only be entered from underground; then he discovered the grooves of the transport system, and changed his mind.'

  'Did he try to break in?'

  'There was no way he could, without explosives or heavy tools. And he doesn't want to do that until all other approaches have failed.'

  'I have it!' Dennis Solomons suddenly interjected. 'Cocooning!'

  'I beg your pardon?'

  'It's a technique developed a couple of hundred years ago,' continued the science historian. 'Another name for it is mothballing. When you have something you want to preserve, you seal it inside a plastic envelope, and then pump in an inert gas. The original use was to protect military equipment between wars; it was once applied to whole ships. It's still widely used in museums that are short of storage space; no one knows what's inside some of the hundred-year-old cocoons in the Smithsonian basement.'

  Patience was not one of Carlisle Perera's virtues; he was aching to drop his bombshell, and could restrain himself no longer. 'Please, Mr. Ambassador! This is all very interesting, but I feel my information is rather more urgent.'

  'If there are no other points—very well, Dr. Perera.'

  The exobiologist, unlike Conrad Taylor, had not found Rama a disappointment. It was true that he no longer expected to find life but sooner or later, he had been quite sure, some remains would be discovered of the creatures who had built this fantastic world. The exploration had barely begun, although the time available was horribly brief before Endeavour would be forced to escape from her present sun-grazing orbit.

  But now, if his calculations were correct, Man's contact with Rama would be even shorter than he had feared. For one detail had been overlooked—because it was so large that no one had noticed it before.

  'According to our latest information,' Perera began, 'one party is now on its way to the Cylindrical Sea, while Commander Norton has another group setting up a supply base at the foot of Stairway Alpha. When that's established, he intends to have at least two exploratory missions operating at all times. In this way he hopes to use his limited manpower at maximum efficiency.'

  'It's a good plan, but there may be no time to carry it out. In fact, I would advise an immediate alert, and a preparation for total withdrawal at twelve hours' notice. Let me explain…'

  'It's surprising how few people have commented on a rather obvious anomaly about Rama. It's now well inside the orbit of Venus yet the interior is still frozen. But the temperature of an object in direct sunlight at this point is about five hundred degrees!'

  'The reason of course, is that Rama hasn't had time to warm up. It must have cooled down to near absolute zero—two hundred and seventy below—while it was in interstellar space. Now, as it approaches the sun, the outer hull is already almost as hot as molten lead. But the inside will stay cold, until the heat works its way through that kilometre of rock.'

  'There's some kind of fancy dessert with a hot exterior and ice-cream in the middle—I don't remember what it's called—'

  'Baked Alaska. It's a favourite at UP banquets, unfortunately.'

  'Thank you, Sir Robert. That's the situation in Rama at the moment, but it won't last. All these weeks, the solar heat has been working its way through, and we expect a sharp temperature rise to begin in a few hours. That's not the problem; by the time we'll have to leave anyway, it will be no more than comfortably tropical.'

  'Then what's the difficulty?'

  'I can answer in one word, Mr. Ambassador. Hurricanes.'

  CHAPTER 15

  THE EDGE OF THE SEA

  THERE WERE NOW more than twenty men and women inside Rama—six of them down on the plain, the rest ferrying equipment and expendables through the airlock system and down the stairway. The ship itself was almost deserted, with the minimum possible staff on duty; the joke went around that Endeavour was really being run by the four simps and that Goldie had been given the rank of Acting-Commander.

  For these first explorations, Norton had established a number of ground rules; the most important dated back to the earliest days of man's space-faring. Every group, he had decided, must contain one person with prior experience. But not more than one. In that way, everybody would have an opportunity of learning as quickly as possible.

  And so the first party to head for the Cylindrical Sea, though it was led by Surgeon-Commander Laura Ernst, had as its one-time veteran Lt. Boris Rodrigo, just back from Paris. The third member, Ser
geant Pieter Rousseau, had been with the back-up teams at the Hub; he was an expert on space reconnaissance instrumentation, but on this trip he would have to depend on his own eyes and a small portable telescope.

  From the foot of Stairway Alpha to the edge of the Sea was just under fifteen kilometres—or an Earth-equivalent of eight under the low gravity of Rama. Laura Ernst, who had to prove that she lived up to her own standards, set a brisk pace. They stopped for thirty minutes at the mid-way mark, and made the whole trip in a completely uneventful three hours.

  It was also quite monotonous, walking forward in the beam of the searchlight through the anechoic darkness of Rama. As the pool of light advanced with them, it slowly elongated into a long, narrow ellipse; this foreshortening of the beam was the only visible sign of progress. If the observers up on the Hub had not given them continual distance checks, they could not have guessed whether they had travelled one kilometre, or five, or ten. They just plodded onwards through the million-year-old night, over an apparently seamless metal surface.

  But at last, far ahead at the limits of the now-weakening beam, there was something new. On a normal world it would have been a horizon; as they approached, they could see that the plain on which they were walking came to an abrupt stop. They were nearing the edge of the Sea.

  'Only a hundred metres,' said Hub Control. 'Better slow down.'

  That was hardly necessary, yet they had already done so. It was a sheer straight drop of fifty metres from the level of the plain to that of the Sea—if it was a sea, and not another sheet of that mysterious crystalline material. Although Norton had impressed upon everyone the danger of taking anything for granted in Rama, few doubted that the Sea was really made of ice. But for what conceivable reason was the cliff on the southern shore five hundred metres high, instead of the fifty here?