The holes increased in number. Then there were no holes at all, but only clouds breaking up the clear view of the ground beneath. And presently again even the clouds were left behind and the air was clear—but still there was no horizon—and there was brownish earth with small green patches and beyond was sere brown range. At seventeen thousand feet there were simply no details.
Soon the clouds were merely a white-tipped elevation of the white haze to the sides and behind. And then there came a new sound above the droning roar of the motors. Joe heard it—and then he saw.
Something had flashed down from nowhere. It flashed on ahead and banked steeply. It was a fighter jet, and for an instant Joe saw the distant range seem to ripple and dance in its exhaust blast. It circled watchfully.
The transport pilot manipulated something. There was a change in the sound of the motors. Joe followed the co-pilot’s eyes. The jet fighter was coming up astern, dive brakes extended to reduce its speed. It overhauled the transport very slowly. And then the transport’s pilot touched one of the separate prop-controls gently, and again, and again. Joe, looking at the jet, saw it through the whirling blades. There was an extraordinary stroboscopic effect. One of the two starboard propellers, seen through the other, abruptly took on a look which was not that of mistiness at all, but of writhing, gyrating solidity. The peculiar appearance vanished, and came again, and vanished and appeared yet again before it disappeared completely.
The jet shot on ahead. Its dive brakes retracted. It made a graceful, wallowing, shallow dive, and then climbed almost vertically. It went out of sight.
“Visual check,” said the co-pilot drily, to Joe. “We had a signal to give. Individual to this plane. We didn’t tell it to you. You couldn’t duplicate it.”
Joe worked it out painfully. The visual effect of one propeller seen through another—that was identification. It was not a type of signaling an unauthorized or uninformed passenger would expect.
“Also,” said the co-pilot, “we have a television camera in the instrument board yonder. We’ve turned it on now. The interior of the cabin is being watched from the ground. No more tricks like the phony colonel and the atom bomb that didn’t ‘explode.’ ”
Joe sat quite still. He noticed that the plane was slanting gradually downward. His eyes went to the dial that showed descent at somewhere between two and three hundred feet a minute. That was for his benefit. The cabin was pressurized, though it did not attempt to simulate sea-level pressure. It was a good deal better than the outside air, however, and yet too quick a descent meant discomfort. Two to three hundred feet per minute is about right.
The ground took on features. Small gulleys. Patches of coloration too small to be seen from farther up. The feeling of speed increased. After long minutes the plane was only a few thousand feet up. The pilot took over manual control from the automatic pilot. He seemed to wait. There was a plaintive, mechanical beep-beep and he changed course.
“You’ll see the Shed in a minute or two,” said the co-pilot. He added vexedly, as if the thing had been bothering him, “I wish I hadn’t missed that sandy-haired guy putting his hand in the wheel well! Nothing happened, but I shouldn’t have missed it!”
Joe watched. Very, very far away there were mountains, but he suddenly realized the remarkable flatness of the ground over which they were flying. From the edge of the world, behind, to the very edge of these far-distant hills, the ground was flat. There were gullies and depressions here and there, but no hills. It was flat, flat, flat. …
The plane flew on. There was a tiny glimmer of sunlight. Joe strained his eyes. The sunlight glinted from the tiniest possible round pip on the brown earth. It grew as the plane flew on. It was half a cherry stone. It was half an orange, with gores. It was the top section of a sphere that was simply too huge to have been made by men.
There was a thin thread of white that ran across the dun-colored range and reached that half-ball and then ended. It was a highway. Joe realized that the half-globe was the Shed, the monstrous building made for the construction of the Space Platform. It was gigantic. It was colossal. It was the most stupendous thing that men had ever created.
Joe saw a tiny projection near the base of it. It was an office building for clerks and timekeepers and other white-collar workers. He strained his eyes again and saw a motor truck on the highway. It looked extraordinarily flat. Then he saw that it wasn’t a single truck but a convoy of them. A long way back, the white highway was marked by a tiny dot. That was a motor bus.
There was no sign of activity anywhere, because the scale was so great. Movement there was, but the things that moved were too small to be seen by comparison with the Shed. The huge, round, shining half-sphere of metal stood tranquilly in the midst of emptiness.
It was bigger than the pyramids.
The plane went on, descending. Joe craned his neck, and then he was ashamed to gawk. He looked ahead, and far away there were white speckles that would be buildings: Bootstrap, the town especially built for the men who built the Space Platform. In it they slept and ate and engaged in the uproarious festivity that men on a construction job crave on their time off.
The plane dipped noticeably.
“Airfield off to the right,” said the co-pilot. “That’s for the town and the job. The jets—there’s an air umbrella overhead all the time—have a field somewhere else. The pushpots have a field of their own, too, where they’re training pilots.”
Joe didn’t know what a pushpot was, but he didn’t ask. He was thinking about the Shed, which was the greatest building ever put up, and had been built merely to shelter the greatest hope for the world’s peace while it was put together. He’d be in the Shed presently. He’d work there, setting up the contents of the crates back in the cargo space, and finally installing them in the Platform itself.
The pilot said: “Pitot and wing heaters?”
“Off,” said the co-pilot.
“Spark and advance——”
Joe didn’t listen. He looked down at the sprawling small town with white-painted barracks and a business section and an obvious, carefully designed recreation area that nobody would ever use. The plane was making a great half-circle. The motor noise dimmed as Joe became absorbed in his anticipation of seeing the Space Platform and having a hand in its building.
The co-pilot said sharply: “Hold everything!”
Joe jerked his head around. The co-pilot had his hand on the wheel release. His face was tense.
“It don’t feel right,” he said very, very quietly. “Maybe I’m crazy, but there was that sandy-haired guy who put his hand up in the wheel well back at that last field. And this don’t feel right!”
The plane swept on. The airfield passed below it. The co-pilot very cautiously let go of the wheel release, which when pulled should let the wheels fall down from their wells to lock themselves in landing position. He moved from his seat. His lips were pinched and tight. He scrabbled at a metal plate in the flooring. He lifted it and looked down. A moment later he had a flashlight. Joe saw the edge of a mirror. There were two mirrors down there, in fact. One could look through both of them into the wheel well.
The co-pilot made quite sure. He stood up, leaving the plate off the opening in the floor.
“There’s something down in the wheel well,” he said in a brittle tone. “It looks to me like a grenade. There’s a string tied to it. At a guess, that sandy-haired guy set it up like that saboteur sergeant down in Brazil. Only—it rolled a little. And this one goes off when the wheels go down. I think, too, if we belly-land——Better go around again, huh?”
The pilot nodded. “First,” he said evenly,