It was a mildly malicious trick to play. Behind the Iron Curtain, broadcasts from the free world couldn't be heard because of stations built to emit pure noise and drown them out. But the jamming stations were on the enemy nations' borders. If radio programs came down from overhead, jamming would be ineffective at least in the center of the nations. Populations would hear the truth, even though their governments objected.

But that was a minor matter, after all. With space ship hulls coming into being by dozens, and with one convoy of hundreds of tons of equipment gotten aloft, the whole picture of supply for the Platform had changed.

Part of the new picture was two devices that Haney and the Chief were assembling. They were mostly metal backbone and a series of tanks, with rocket motors mounted on ball and socket joints. They looked like huge red insects, but they were officially rocket recovery vehicles, and Joe's crew referred to them as space wagons. They had no cabin, but something like a saddle. Before it there was a control-board complete with radar-screens. And there were racks to which solid-fuel rockets of divers sizes could be attached. They were literally short-range tow craft for travel in space. They had the stripped, barren look of farm machinery. So the name "space wagon" fitted. There were two of them.

"We're putting the pair together," the Chief told Joe. "Looks kinda peculiar."

"It's only for temporary use," said Joe. "There's a bigger and better one being built with a regular cabin and hull. But some experience with these two will be useful in running a regular space tug."

The Chief said with a trace too much of casualness: "I'm kind of looking forward to testing this."

"No," said Joe doggedly. "I'm responsible. I take the first chance. But we should all be able to handle them. When this is assembled you can stand by with the second one. If the first one works all right, we'll try the second."

The Chief grimaced, but he went back to the assembly of the spidery device.

Joe got out the gravity-simulator harnesses. He showed Brent how they worked. Brown hadn't official instructions to order their use, but Joe put one on himself, set for full Earth-gravity simulation. He couldn't imitate actual gravity, of course. Only the effect of gravity on one's muscles. There were springs and elastic webbing pulling one's shoulders and feet together, so that it was as much effort to stand extended—with one's legs straight out—as to stand upright on Earth. Joe felt better with a pull on his body.

Brent was upset when he found that to him more than a tenth of normal gravity was unbearable. But he kept it on at that. If he increased the pull a very little every day, he might be able to return to Earth, in time. Now it would be a very dangerous business indeed. He went off to put the other members of the crew in the same sort of harness.