'Skipper! Will you take an 02 reading?’
There was a much longer pause than the request justified. Then Norton radioed back: 'I think there's something wrong with my meter.’
A slow smile spread across Mercer's face.
'It's up fifty per cent, isn't it?’
'Yes, what does that mean?’
'It means that we can all take off our masks. Isn't that convenient?’
'I'm not sure,' replied Norton, echoing the sarcasm in Mercer's voice. 'It seems too good to be true.' There was no need to say any more. Like all spacemen, Commander Norton had a profound suspicion of things that were too good to be true.
Mercer cracked his mask open a trifle, and took a cautious sniff. For the first time at this altitude, the air was perfectly breathable. The musty, dead smell had gone; so had the excessive dryness, which in the past had caused several respiratory complaints. Humidity was now an astonishing eighty per cent; doubtless the thawing of the Sea was responsible for this. There was a muggy feeling in the air, though not an unpleasant one. It was like a summer evening, Mercer told himself, on some tropical coast. The climate inside Rama had improved dramatically during the last few days...
And why? The increased humidity was no problem; the startling rise in oxygen was much more difficult to explain.
As he recommenced the descent, Mercer began a whole series of mental calculations. He 'had not arrived at any satisfactory result by the time they entered the cloud layer.
It was a dramatic experience, for the transition was very abrupt. At one moment they were sliding downwards in clear air, gripping the smooth metal of the handrail so that they would not gain speed too swiftly in this quarter-of-a-gravity region. Then, suddenly, they shot into a blinding white fog, and visibility dropped to a few metres. Mercer put on the brakes so quickly that Calvert almost bumped into him - and Myron did bump into Calvert, nearly knocking him off the rail.
'Take it easy,' said Mercer. 'Spread out so we can just see each other. And don't let yourself build up speed, in case I have to stop suddenly.’
In eerie silence, they continued to glide, downwards through 'the fog. Calvert could just see Mercer as a vague shadow ten metres ahead, and 'when he looked back, 'Myron was at the same distance behind him. In some ways, this was even spookier than descending in the complete darkness of the Raman night; then, at least, the searchlight beams had shown them what lay ahead. But' this was like diving in poor visibility in the open sea.
It was impossible to tell how far they had travelled, and Calvert guessed they had almost reached the fourth level when Mercer suddenly braked again. When they had bunched together, he whispered: 'Listen! Don't you hear something?’
'Yes,' said Myron, after a minute. 'It sounds like the wind.’
Calvert was not so sure. He turned his head back and forth, trying to locate the direction of the very faint murmur that had come to them through the fog, then abandoned the attempt as hopeless.
They continued the slide, reached the fourth level, and started on towards the fifth. All the while the sound grew louder - and more hauntingly familiar. They were halfway down the fourth stairway before Myron called out: 'Now do you recognize it?’
They would have identified it bong ago, but it was not a sound they would ever have associated with any world except Earth. Coming out of the fog, from a source whose distance could not be guessed, was the steady thunder of falling water.
A few minutes later, the cloud ceiling ended as abruptly as it had begun. They shot out into the blinding glare of the Raman day, made more brilliant by the bight reflected from the low-hanging clouds. There was the familiar curving plain - now made more acceptable to mind and senses, because its full circle could no longer be seen. It was not too difficult to pretend that they were booking along a broad valley, and that the upward sweep of the Sea was really an outward one.
They halted at the fifth and penultimate platform, to report that they were through the cloud cover and to make a careful survey. As far as they could tell, nothing had changed down there on the plain; but up here on the Northern dome, Rama had brought forth another wonder.
So there was the origin of the sound they had heard. Descending from some hidden source in 'the clouds three or four kilometres away was a waterfall, and for long minutes they stared at it silently, almost unable to believe their eyes. Logic told them that on this spinning world no falling object could move in a straight line, but there was something horribly unnatural about a curving waterfall that curved sideways, to end many kilometres away from the point directly below its source...
'If Galileo had been born in this world,' said Mercer at length, 'he'd have gone crazy working out the laws of dynamics.’
'I thought I knew them,' Calvert replied, 'and I'm going crazy anyway. Doesn't it upset you, Prof?’
'Why should it?' said Sergeant Myron. 'It's a perfectly straightforward demonstration of the Coriolis Effect. I wish I could show it to some of my students.’
Mercer was staring thoughtfully at the globe-circling band of the Cylindrical Sea.
'Have you noticed what's happened to the water?' he said at last.
'Why - it's no longer so blue. I'd call it pea-green. What does that signify?’
'Perhaps the same thing that it does on Earth. Laura called the Sea an organic soup waiting to be shaken into life. Maybe that's exactly what's happened.’
'In a couple of days! It took millions of years on Earth.’
'Three hundred and seventy-five million, according to the latest estimate. So that's where the oxygen's come from. Rama's shot through the anaerobic stage and has got to photosynthetic plants - in about forty-eight hours. I wonder what it will produce tomorrow?’
CHAPTER TWENTY TWO - To Sail the Cylindrical Sea
When they reached the foot of the stairway, they had another shock. At first, it appeared that something had gone through the camp, overturning equipment, even collecting smaller objects and carrying them away. But after a brief examination, their alarm was replaced by a rather shame-faced annoyance.
The culprit was only the wind; though they had tied down all loose objects before they left, some ropes must have parted during exceptionally strong gusts. It was several days before they were able to retrieve all their scattered property.
Otherwise, there seemed no major changes. Even the silence of Rama had returned, now that the ephemeral storms of spring were over. And out there at the edge of the plain was a calm sea, waiting for the first ship in a million years. 'Shouldn't one christen a new boat with a bottle of champagne?’
'Even if we had any on board, I wouldn't allow such a criminal waste. Anyway, it's too late. We've already launched the thing.’
'At least it does float. You've won your bet, Jimmy. I'll settle when we get back to Earth.’
'It's got to have a name. Any ideas?’
The subject of these unflattering comments was now bobbing beside the steps beading down into the Cylindrical Sea. It was a small raft, constructed from six empty storage drums held together by a light metal framework. Building it, assembling it at Camp Alpha and hauling it on demountable wheels across more than ten kilometres of plain had absorbed the crew's entire energies for several days. It was a gamble that had better pay off.
The prize was worth the risk. The enigmatic towers of New York, gleaming there in the shadowless bight five kilometres away, had taunted them ever since they had entered Rama. No one doubted that the city - or whatever it might be - was the real heart of this world. If they did nothing else, they must reach New York.
'We still don't have a name. Skipper - what about it?’
Norton laughed, then became suddenly serious.
'I've got one for you. Call it Resolution.’
'Why?’
'That was one of Cook's ships. It's a good name - may she live up to it.’
There was a thoughtful silence; then Sergeant Barnes, who had been principally responsible for the design, asked for three volunteer
s. Everyone present held up a hand.
'Sorry - we only have four life-jackets. Boris, Jimmy, Pieter - you've all done some sailing. Let's try her out.’
No one thought it in the least peculiar that an Executive Sergeant was now taking charge of the proceedings. Ruby Barnes had the only Master's Certificate aboard, so that settled the matter. She had navigated racing trimarans across the Pacific, and it did not seem likely that a few kilometres of dead-calm water could present much of a challenge to her skills.
Ever since she had set eyes upon the Sea, she had been determined to make this voyage. In all the thousands of years that man had had dealings with the waters of his own world, no sailor had ever faced anything remotely like this. In the last few days a silly little jingle had been running through her mind, and she could not get rid of it. 'To sail the Cylindrical Sea...' Well, that was precisely what she was going to do.
Her passengers took their places on the improvised bucket seats, and Ruby opened the throttle. The twenty kilowatt motor started to whirr, the chain-drives of the reduction gear blurred, and Resolution surged away to the cheers of the spectators.
Ruby had hoped to get fifteen kph with this load, but would settle for anything over ten. A half-kilometre course had been measured along the cliff, and she made the round trip in five and a half minutes. Allowing for turning time, this worked out at twelve kph; she was quite happy with that.
With no power, but with three energetic paddlers helping her own more skilful blade, Ruby was able to get a quarter of this speed. So even if the motor broke down, they could get back to shore in a couple of hours. The heavy-duty power cells could provide enough energy to circumnavigate the world; she was carrying two spares, to be on the safe side. And now that the fog had completely burned away, even such a cautious mariner as Ruby was prepared to put to sea without a compass.
She saluted smartly as she stepped ashore.
'Maiden voyage of Resolution successfully completed, Sir. Now awaiting your instructions.’
'Very good ... Admiral. When will you be ready to sail?’
'As soon as stores can be loaded aboard, and the Harbour Master gives us clearance.’
'Then we leave at dawn.’
'Aye, aye, Sir.’
Five kilometres of water does not seem very much on a map; it is very different when one is in the middle of it. They had been cruising for only ten minutes, and the fifty-metre cliff facing the Northern Continent already seemed a surprising distance away. Yet, mysteriously, New York hardly appeared much closer than before...
But most of the time they paid little attention to the land; they were still too engrossed in the wonder of the Sea. They no longer made the nervous jokes that had punctuated the start of the voyage; this new experience was too overwhelming.
Every time, Norton told himself, he felt that he had grown accustomed to Rama, it produced some new wonder. As Resolution hummed steadily forward, it seemed that they were caught in the trough of a gigantic wave - a wave which curved u~ on either side until it became vertical - then overhung until the two flanks met in a liquid arch sixteen kilometres above their heads. Despite everything that reason and logic told them, none of the voyagers could for long throw off the impression that at any minute those millions of tons of water would come crashing down from the sky.
Yet despite this, their main feeling was one of exhilaration; there was a sense of danger, without any real danger. Unless, of course, the Sea itself produced any more surprises.
That was a distinct possibility, for as Mercer had guessed, the water was now alive. Every spoonful contained thousands of spherical, single-celled micro-organisms, similar to the earliest forms of plankton that had existed in the oceans of Earth.
Yet they showed puzzling differences; they lacked a nucleus, as well as many of the other minimum requirements of even the most primitive terrestrial life-forms. And although Laura Ernst - now doubling as research scientist as well as ship's doctor - had proved that they definitely generated oxygen, there were far too few of them to account for the augmentation of Rama's atmosphere. They should have existed in billions, not mere thousands.
Then she discovered that their numbers were dwindling rapidly, and must have been far higher during the first hours of the Raman dawn. It was as if there had been a brief explosion of life, recapitulating on a trillion fold swifter time-scale the early history of Earth. Now, perhaps, it had exhausted itself; the drifting micro-organisms were disintegrating, releasing their stores of chemicals back into the Sea.
'If you have to swim for it,' Dr Ernst had warned the mariners, 'keep your mouths closed. A few drops won't matter - if you spit them out right away. But all those weird organo-metallic salts add up to a fairly poisonous package, and I'd hate to have to work out an antidote.’
This danger, fortunately, seemed very unlikely. Resolution could stay afloat if any two of her buoyancy tanks were punctured. (When told of this, Joe Calvert had muttered darkly: 'Remember the Titanic! ') And even if she sank, the crude but efficient life-jackets would keep their heads above, water. Although Laura had been reluctant to give a firm ruling on this, she did not think that a few hours' immersion in the Sea would be fatal; but she did not recommend it.
After twenty minutes of steady progress, New York was no longer a distant island. It was becoming a real place, and details which they had seen only through telescopes and photo-enlargements were now revealing themselves as massive, solid structures. It was now strikingly apparent that the 'city', like so much of Rama, was triplicated; it consisted of three identical, circular complexes or superstructures, rising from a long, oval foundation. Photographs taken from the Hub also indicated that each complex was itself divided into three equal components, like a pie sliced into 120-degree portions. This would greatly simplify the task of exploration; presumably they had to examine only one ninth of New York to have seen the whole of it. Even this would be a formidable undertaking; it would mean investigating at least a square kilometre of buildings and machinery, some of which towered hundreds of metres into the air.
The Ramans, it seemed, had brought the art of triple redundancy to a high degree of perfection. This was demonstrated in the airlock system, the stairways at the Hub, the artificial suns. And where it really mattered, they had even taken the next step. New York appeared to be an example of triple-triple redundancy.
Ruby was steering Resolution towards the central complex, where a flight of steps led up from the water to the very -top of the wall or levee which surrounded the island. There was even a conveniently-placed mooring post to which boats could be tied; when she saw this, Ruby became quite excited. Now she would never be content until she found one of the craft in which the Ramans sailed their extraordinary sea.
Norton was the first to step ashore; he looked back at his three companions and said: 'Wait here on the boat until I get to the top -of the wall. When I wave, Pieter and Boris will join me. You stay at the helm, Ruby, so that we can cast off at a moment's notice. If anything happens to me, report to Karl and follow his instructions. Use your best judgement - but no heroics. Understood?' 'Yes, Skipper. Good luck!’
Commander Norton did not really believe in luck; he never got into a situation until he had analysed all the factors involved and had secured his line of retreat. But once again Rama was forcing him to break some of his cherished rules. Almost every factor here- was unknown as unknown as the Pacific and the Great Barrier Reef had been to his hero, three and a half centuries ago... Yes, he could do with all the luck that happened to be lying around.
The stairway was a virtual duplicate of the one down which they had descended on the other side of the Sea; doubtless his friends over there Were looking straight across at him through their telescopes. And 'straight' was now the correct word; in this one direction, parallel to the axis of Rama, the Sea was indeed completely flat. It might well be the only body of water in the universe of which this was true, for on all other worlds, every sea or lake must follow the surface of
a sphere, with equal curvature in all directions.
'Nearly at the top,' he reported, speaking for the record and for his intently listening second-in-command, five kilometres away, 'still completely quiet - radiation normal. I'm holding the meter above my head, just in case this wall is acting as a shield for anything. And if there are any hostiles on the other side, they'll shoot that first.’
He was joking, of course. And yet - why take any chances, when it was just as easy to avoid them?
When he - took the last step, he found that the flat-topped embankment was about ten metres thick; on the inner side, an alternating series of ramps and stairways led down to the main level of the city, twenty metres below. In effect, he was standing on a high wall which completely surrounded New York, and so was able to get a grandstand view of it.
It was a view almost stunning in its complexity, and his first act was to make a slow panoramic scan with his camera. Then he waved to his companions and radioed back across the Sea: 'No sign of any activity - everything quiet. Come on up - we'll start exploring.’
CHAPTER TWENTY THREE - NY, Rama
It was not a city; it was a machine. Norton had come to that conclusion in ten minutes, and saw no reason to change it after they had made a complete traverse of the island. A city - whatever - the nature of its occupants surely had to provide some form of accommodation: there was nothing here of that - nature, unless it was underground. And if that was the case, where were the entrances, the stairways, the elevators? He had not found anything that even qualified as a simple door...
The closest analogy he had ever seen to this place on Earth was a giant chemical processing plant. However, there were no stockpiles of raw materials, or any indications of a transport system to move them around. Nor could he imagine where the finished product would emerge - still less what that product could possibly be. It was all very baffling, and more than a little frustrating.
'Anybody care to make a guess?' he said at last, to all who might be listening. 'If this is a factory, what does it make? And where does it get its raw materials?’
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