Sessui had driven his students back to work with the admonition that they would have plenty of time for sight-seeing during the long climb back to Midway. Yet it was noticeable that even the Professor himself sometimes stood at the observation window for minutes at a time, entranced by the spectacle of the burning heavens.

Someone had christened the project “Expedition to Earth” – which, as far as distance was concerned, was ninety-eight percent accurate. As the capsule crawled down the face of the Tower at its miserable five hundred klicks, the increasing closeness of the planet beneath made itself obvious. For gravity was slowly increasing, from the delightful less-than-lunar buoyancy of Midway to almost its full terrestrial value. To any experienced space traveller, this was strange indeed: feeling any gravity before the moment of atmospheric entry seemed a reversal of the normal order of things.

Apart from complaints about the food, stoically endured by the overworked steward, the journey had been devoid of incident. A hundred kilometres from the Basement, the brakes had been gently applied and speed had been halved. It was halved again at fifty kilometers – for, as one of the students remarked: “Wouldn't it be embarrassing if we ran off the end of the track?”

The driver (he insisted on being called pilot) retorted that this was inpossible, as the guidance slots down which the capsule was falling terminated several metres short of the Tower's end; there was also an elaborate buffer system, just in case all four independent sets of brakes failed to work. And everyone agreed that the joke, besides being perfectly ridiculous, was in extremely poor taste.

41. Meteor

The vast artificial lake known for two thousand years as the Sea of Paravana lay calm and peaceful beneath the stone gaze of its builder. Though few now visited the lonely statue of Kalidasa's father, his work, if not his fame, had outlasted that of his son; and it had served his country infinitely better, bringing food and drink to a hundred generations of men. And to many more generations of birds, deer, buffalo, monkeys and their predators, like the sleek and well-fed leopard now drinking at the water's edge. The big cats were becoming rather too common and were inclined to be a nuisance, now that they no longer had anything to fear from hunters. But they never attacked men, unless they were cornered or molested.

Confident of his security, the leopard was leisurely drinking his fill, as the shadows round the lake lengthened and twilight advanced from the east. Suddenly, he pricked up his ears and became instantly alert; but no mere human senses could have detected any change in land, water or sky. The evening was as tranquil as ever.

And then, directly out of the zenith, came a faint whistling that grew steadily to a rumbling roar, with tearing, ripping undertones, quite unlike that of a re-entering spacecraft. Up in the sky something metallic was sparkling in the last rays of the sun, growing larger and larger and leaving a trail of smoke behind it. As it expanded, it disintegrated; pieces shot off in all directions, some of them burning as they did so. For a few seconds an eye as keen as the leopard's might have glimpsed a roughly cylindrical object, before it exploded into a myriad fragments. But the leopard did not wait for the final catastrophe; it had already disappeared into the jungle.

The Sea of Paravana erupted in sudden thunder. A geyser of mud and spray shot a hundred metres into the air – a fountain far surpassing those of Yakkagala, and one indeed almost as high as the Rock itself. It hung suspended for a moment in futile defiance of gravity, then tumbled back into the shattered lake.

Already, the sky was full of waterfowl wheeling in startled flight. Almost as numerous, flapping among them like leathery pterodactyls who had somehow survived into the modern age, were the big fruit-bats who normally took to the air only after dusk. Now, equally terrified, birds and bats shared the sky together.

The last echoes of the crash died away into the encircling jungle; silence swiftly returned to the lake. But long minutes passed before its mirror surface was restored and the little waves ceased to scurry back and forth beneath the unseeing eyes of Paravana the Great.

42. Death in Orbit

Every large building, it is said, claims a life; fourteen names were engraved on the piers of the Gibraltar Bridge. But thanks to an almost fanatical safety campaign, casualties on the Tower had been remarkably low. There had, indeed, been one year without a single death.

And there had been one year with four – two of them particularly harrowing. A space-station assembly supervisor, accustomed to working under zero gravity, had forgotten that though he was in space he was not in orbit – and a life-time's experience had betrayed him. He had plummeted more than fifteen thousand kilometres, to burn up like a meteor upon entry into the atmosphere. Unfortunately his suit radio had remained switched on during those last few minutes…

It was a bad year for the Tower; the second tragedy had been much more protracted, and equally public. An engineer on the counterweight, far beyond synchronous orbit, had failed to fasten her safety belt properly – and had been flicked off into space like a stone from a sling. She was in no danger, at this altitude, either of falling back to earth or of being launched on an escape trajectory; unfortunately her suit held less than two hours' air. There was no possibility of rescue at such short notice; and despite a public outcry, no attempt was made. The victim had co-operated nobly. She had transmitted her farewell messages, and then – with thirty minutes of oxygen still unused – had opened her suit to vacuum. The body was recovered a few days later, when the inexorable laws of celestial mechanics brought it back to the perigee of its long ellipse.

These tragedies flashed through Morgan's mind as he took the highspeed elevator down to the Operations Room, closely followed by a sombre Warren Kingsley and the now almost forgotten Dev. But this catastrophe was of an altogether different type, involving an explosion at or near the Basement of the Tower. That the transporter had fallen to earth was obvious, even before the garbled report had been received of a “giant meteor shower” somewhere in central Taprobane.

It was useless to speculate until he had more facts; and in this case, where all the evidence had probably been destroyed, they might never be available. He knew that space accidents seldom had a single cause; they were usually the result of a chain of events, often quite harmless in themselves. All the foresight of the safety engineers could not guarantee absolute reliability, and sometimes their own over-elaborate precautions contributed to disaster. Morgan was not ashamed of the fact that the safety of the project now concerned him far more than any loss of life. Nothing could be done about the dead, except to ensure that the same accident could never happen again. But that the almost completed Tower might be endangered was a prospect too appalling to contemplate.

The elevator floated to a halt, and he stepped out into the Operations Room – just in time for the evening's second stunning surprise.