They reached the curved wall that was the lower half of the docking bay within a few minutes, arriving just forward of a wide ring bristling with hydraulic struts that Greenburg knew marked the position of the emergency docking collar. He glanced back at it as they headed forward under the wall's curve, wondering why the backup system hadn't worked. It should have kicked in as soon as the main collar's supports gave way.
"Watch your step," Lewis said sharply, and Greenburg paused in midstep, focusing for the first time on the dark-red puddle edging onto the path in front of him. Peering along the base of the wall, he could see more of the liquid, more or less collected in a narrow trough there. He squatted, touched it tentatively with a fingertip. It felt thick and oily. "Hydraulic fluid?" Lewis asked.
"Yeah. From the emergency collar, probably." Greenburg straightened and, with only a slight hesitation, rubbed the fluid off on his jumpsuit. Stepping carefully around the puddle in his path, he continued on.
The panel they'd decided on was precisely where the blueprints had said it would be: some two meters around the port wall from the heavy forward clamp machinery at the docking bay's forward tip. About forty centimeters by seventy, the panel sat chest-high in the wall and was, for a wonder, not even partially blocked by any of the conveyor equipment. Selecting a wrench from his belt, Greenburg began loosening the nuts.
"I hope there's nothing in here that can't take low air pressure," Lewis remarked as he untangled the two oxygen sets he was carrying and clipped one of the tanks onto the back of Greenburg's belt. "You want me to put the mask on you?"
"I'll put it on when I get this open," Greenburg grunted as he strained against a particularly well tightened nut. "I don't like stuff hanging from my face while I'm working. Distracts me."
"Put it on before you lose pressure in there, Aaron," Betsy's voice came in his ear.
"Aw, come on—Bets," he said, the last word a burst of air as the nut finally yielded. "We're only a thousand feet or so higher than Pikes Peak, and I've been climbing around up there since I was ten. I'm not going to black out up here for lack of air."
"Well... all right. But I want it on you as soon as you've finished with the panel."
"Sure."
It took only a couple of minutes to loosen all the nuts and, with Lewis's help, remove them and force the panel out of its rubber seating. For a minute there was a minor gale at their backs as the pressure inside the cargo deck equalized with that in the bay, and Greenburg realized belatedly he'd forgotten to check whether or not Lewis had remembered to close the hatch behind him. If he hadn't this windstorm was going to keep going for quite a while... but even as he finished adjusting his oxygen mask over his nose and mouth the rush of air began to subside and finally stilled completely. "Here goes," Greenburg muttered as, stooping slightly, he eased his head through the opening, blinking as a cold breeze swept his face.
It was an impressive sight. Even twisted too far toward the bay's starboard wall, the shuttle's nose still seemed almost close enough for him to touch as it loomed over him, vibrating noticeably in the incomplete grip the broken collar provided. To his left and only slightly below him, he could see that the shuttle's front landing gear had descended just as it was supposed to, and was hanging tantalizingly close to the extended forward clamp. Moving his mike right up against his oxygen mask—it was noisier in the bay than he'd expected—he said, "Okay. First of all, I can't see anything that could be interfering with the clamp or arm. Rick, do the telltales read the arm as fully extended?"
A short pause, then Henson's voice. "Sure do. It's still got lateral and vertical play, though. Want me to swing it around any?"
"Waste of time, as long as it's too short. Someone's going to have to go down there and take a look at it, I guess."
"That's not your job, though," Betsy spoke up. "Carl's lining up a mechanical crew to come up from the airport as soon as it's safe. They can do all the work that's needed in the bay."
"I'm sure they'll be thrilled at the prospect—and don't worry, I wasn't volunteering." Greenburg twisted his head around the other direction. "Now, as to the shuttle door... hell. I can't be certain, but it looks like the edge of the collar is overlapping it—the shuttle must have slid back and then shot forward and starboard as the collar was engaging. What the hell kind of guidance system error could have caused that?"
"We should know in ten or fifteen minutes," an unfamiliar voice put in.
"Who's that?" Greenburg asked.
"Sorry—maybe I shouldn't have butted in. I'm Peter Whitney; I'm helping to run the diagnostic program that will hopefully locate the problem."
"Peter Whitney?—ah, the McDonnell Douglas computer expert Paul Marinos had said he was bringing in. Have you got the program running yet?"
"Yes; a friend just radioed us the loading code."
"Well ahead of ground control's efforts, I might add," Betsy said. "We'll let you know when we identify the glitch. For now, let's get back to the shuttle door, okay? We think the sensors indicate hydraulic pressure problems in the emergency collar. Is there any chance we could fix that and get it to lock onto the shuttle? Then we could release the main collar and get the shuttle door open."
Greenburg shifted position again and peered at the top of the shuttle, wishing all the floodlights hadn't gone when the craft hit. "I don't think there's any chance at all," he said slowly. "As a matter of fact, it looks very much like the emergency collar's responsible for most of the cockpit damage. It seems to have come out of the wall just in time for the shuttle to ram into it. If that kind of impact didn't do anything more than rupture a hydraulic line or two, I'll be very much surprised."
Betsy said something under her breath that Greenburg didn't catch. "You sure about that?" she asked. "I can't see any of that on the monitor."
"As sure as I can be on this side of the bay. I can go to the starboard side if you'd like and check through the panel there. Probably have to go over there to find out exactly where this fluid came from, anyway."
"Maybe later. Any other good news for us from there, first?"
"Actually, this is good news. Somehow, while the shuttle was rattling around the bay, it completely missed the Skyport passenger and cargo tunnels. If we can get everybody out of the shuttle, we can get them into the Skyport."
"Well, that's something. Any suggestions on how we go about carrying out that first step?"
Greenburg frowned. Something about the shuttle was stroking the warning bells in his brain... but he couldn't seem to put his finger on the problem.
"Aaron?"
"Uh... yes." His eyes still probing the vibrating fuselage, Greenburg replayed his mental tape of Betsy's last question. "The, uh, side window of the cockpit seems undamaged. It should be big enough for most of the passengers to squeeze through. Of course, it's a four-meter drop or thereabouts, so we'd need to rig up some way to either get them down and then back up to the tunnel door or else to get them across to it directly. Maybe rig something up to the ski lift mechanism in the tunnel..."
His voice trailed off as the warning bells abruptly went off full force. The nosewheel was slightly closer to him!
"Bets, the shuttle's sliding backwards!" he shouted into the mike. "The collar must be slipping!"