"Some genius in Washington sent this thing down without any covering instructions, but it has to be opened in a hurry in a thin atmosphere. Er--I'd like you to stay on the intercom for a while in case it blows up in my face or something." He tried to laugh, but all that came out was a croak. The attendant nodded indifferently, then helped Forster into the helmet of his pressure suit. He climbed up the steps into the chamber, pulling the airtight door shut behind him. He placed the box on the desk in front of the instrument panel, then turned back to push the door clamps into place. For the first time in the hundreds of hours he'd spent in the tank, he knew the meaning of claustrophobia. Mechanically, he plugged in his intercom and air lines, went through the other routine checks before ascent, tested communications with the lab attendant, then flicked the exhaust motor switch. Now there was little to do except wait. He stared at the box; in the artificial light it seemed full of hidden menace, a knowing aliveness of its own.... Forster shrugged his shoulders impatiently, as though to throw off the vague blanket of uneasiness that was settling around him. So somebody had forgotten to send a covering message with the container, or else it had been mislaid--that could happen, although with security routine as strict as it was, the possibility was remote. All the same, it could happen. After all, what other explanation was there? What was it he was afraid of? There was something about it-- He glanced at the altimeter. The needle showed only 10,000 feet, and seemed to be crawling around the dial. He resolved not to look at it for three minutes by the clock on the panel. When he checked the altimeter again, it registered just over 30,000 feet. Not even half way yet. As the pressure in the tank decreased, he began to be conscious of the need for "reverse breathing"--and he concentrated on using his tongue to check the flow of air into his lungs, then using the thoracic muscles to exhale against the higher pressure inside the suit. Time seemed to be passing in micro-seconds ... 25,000 feet ... 30,000 ... 40,000 ... 50,000. At 62,500 feet he gently tested the cover of the container again; it lifted. As the altimeter needle flickered on the 65,000-foot mark, he cut the exhaust motor and picked up the box. The cover slipped off easily. His feeling of anticlimax was almost ludicrous. As he looked in, all the box contained was a flattened roll of some greyish material. He took it out; despite its comparative bulk, it was feather-light. It had the appearance of metal, but was as porous and pliable as a good grade of bond paper. He could not feel its texture through his heavy gloves. He took a good look. It was new all right--no doubt Washington wanted some tests run on it, although without covering instructions and data this trip was wasted. But some heads would roll when he reported back on the way the container had been shipped in.