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Contact minus 60.
The cupped upper end of the beanstalk, moving almost tangentially to the curve of the Earth’s surface, engulfed the ballast asteroid. The mesh of silicon threads that formed the cup began to take the strain as the ballast sought to continue its upward path. After one second, the stresses stabilized. The trajectory of the upper end of the beanstalk now became geostationary, moving to remain vertically above Quito ’s tether point. The tension in the cable was close to the design maximum value of eighty million newtons per square centimeter. Although the head still descended, that movement was less and less rapid.
The blunt lower end of the beanstalk was visible now from Tether Control. Its movement seemed almost leisurely. It descended like a sluggish, questing blind-worm seeking the pit that would house the tether. Luis Merindo watched his displays as the head disappeared behind the towering piles of rock around the hole. He checked his read-outs. In-filling would begin in thirty seconds. After that, only one question meant anything: Would the tether hold, against the billions of tons of upward force created when the ballast swung wide and high above synchronous orbit?
In the secondary viewing room at Santiago, Howard Anson was also watching the head of the beanstalk. He had no feeling for engineering, and the sight for him brought memories from another time of apocalypse. “Then will I headlong run into the Earth,” he whispered to himself. “Earth gape. Oh no, it will not harbor me. Mountains and hills, come, come and fall on me, and hide me from the heavy wrath of God.”
That earned him a peculiar look from the senate aide sitting next to him. Anson wondered if the man was objecting to his liberties with Marlowe’s classic text. He smiled and shrugged in an embarrassed way, and the other turned his attention back to the screens.
All opportunities for abort were now past. The remaining question centered on the tether. Unless that held, the beanstalk would be dragged from its temporary lodging north of Quito and swing up and away again, out past the Moon. The huge inertia of the system meant that even this question would take many seconds to answer by eye; the smart sensors on the beanstalk would know it in less than a heartbeat.
Contact.
The base of the beanstalk touched the bottom of the pit, five kilometers below ground level. As it did so, mountains began to move. Landslides were following the broad head of the beanstalk into the depths of the prepared chasm. The rumble of detonations, placed carefully around the edge of the pit, merged into the continuous roar of a billion tons of rock as it fell into the pit and packed down under the pressure as more earth and boulders followed.
It was the time of maximum stresses. The cable, caught tight at head and tail, flexed and contorted along its length like an agonized snake. Local transient stresses were ru
There was room in Rob’s head for only three questions: Were the oscillations along the length of the cable in an unstable growth mode? Would the ground tether hold? Was the ballast asteroid secure in its holding cup, a hundred and five thousand kilometers above the Earth?
Five seconds passed. The flickering chaos of signals on the board in front of him began to smooth to a pattern that he could follow even without computer assistance.
Stresses and temperatures were reporting within tolerances.
The ballast was firmly attached at the beanstalk’s upper end.
Signals from Tether Control implied a secure anchor. The final few hundred million tons of rock were falling to the bottom of the pit.
An army of robots stood ready to deploy along the beanstalk.
It was ending, in a mutter of damping stresses and a groan of settling rocks. The beanstalk, stretched tight between the opposing forces of ballast and tether, was molding to a stable configuration, a vast arching bridge between Earth and Heaven. The path was secure between Midgard and Asgard.
Three minutes after Contact, Rob felt comfortable enough to switch displays to the powersat. It was in the right position, lagging the stalk enough to be well out of the way had trouble arisen, close enough to be moved easily to contact with it when the time was right. He signalled it to move in and begin to attach to the superconductors. With ample power for the drive ladder, the robots could begin installation of cargo and passenger transport modules.
As the powersat made its first co
Rob’s intention was to check the position of the leads, but the camera was coincidentally looking straight down along the length of the beanstalk. In the observation center where Howard Anson and Senta Plessey were located, a communal groan went up from the onlookers. The senate aide next to Anson grunted, as though he had been hit hard under the ribs.
“Jesus H.” He turned to Howard and Senta and shook his head. “Do they think they’ll get people to ride that thing? It turns my stomach to think of it.”
His eye, like everyone else’s, was following the cable endlessly down toward Earth. Views from rockets were common enough, but they never gave the onlooker a true feeling for height. There was no direct co
“Are they really pla
Senta turned to him and patted his arm. “Don’t worry.” She smiled. “I feel the same way that you do, but they won’t ask anybody to use it who doesn’t feel comfortable. All the passenger cars will be closed in, so you won’t get any feeling of height. Think of it as just a great big elevator.”
“Elevator?” The aide gave her a sickly smile and turned back to the display. “Fu
“More than that,” Howard Anson said softly. The sight of the cable confirmed all his fears of space travel. “It would be a five-day trip, one-way. And once you started out there’d be no changing your mind. You’d have to ride it all the way.”
“Well, you can have my share of it.” The aide was still staring in horror at the big screen. “I’ll stick to good old rockets. I don’t mind being thought old-fashioned. Look, suppose the power failed on that thing? You’d fall off it and you wouldn’t stop falling until you hit Quito.”
“You can’t fall off,” said Senta. She seemed to be the calmest person in the room. “If the power failed, the cars will stick to the drive train with a mechanical coupling. You’d just hang there until they started the power up again. Anyway, if something did fall off it wouldn’t land at Quito. If you fell off from high enough, you’d miss Earth completely, and finish up back near the point you started from.”