cans you see. Not comfortably, exactly. But they can. Generally speaking, of course, you'll always leave one person in the main ship, so there'll be at most four in the lander."
He led us past the nearest of them, and we all satisfied the impulse to touch, scratch, or pat it. Then he began to lecture:
"There were nine hundred and twenty-four of these ships docked at Gateway when it was first explored. About two hundred, so far, have proved nonoperational. Mostly we don't know why; they just don't work. Three hundred and four have actually been sent out on at least one trip. Thirty-three of those are here now, and available for prospecting trips. The others haven't been tried yet." He hiked himself up on the stumpy cylinder and sat there while he went on:
"One thing you have to decide is whether you want to take one of the thirty-three tested ones or one of the ones that has never been flown. By human beings, I mean. There you just pay your money and take your choice. It's a gamble either way. A high proportion of the trips that didn't come back were in first flights, so there's obviously some risk there. Well, that figures, doesn't it? After all, nobody has done any maintenance on them for God knows how long, since the Heechee put them there.
"On the other hand, there's a risk in the ones that have been out and back safely, too. There's no such thing as perpetual motion. We think some of the no-returns have been because the ships ran out of fuel. Trouble is, we don't know what the fuel is, or how much there is, or how to tell when a ship is about to run out."
He patted the stump. "This, and all the others you see here, were designed for five Heechees in the crews. As far as we can tell. But we send them out with three human beings. It seems the Heechee were more tolerant of each other's company in confined spaces than people are. There are bigger and smaller ships, but the no-return rate on them has been very bad the last couple of orbits. It's probably just a string of bad luck, but… Anyway, I personally would stick with a Three. You people, you do what you want.
"So you come to your second choice, which is who you go with. Keep your eyes open. Look for companions— What?"
Sheri had been semaphoring her hand until she got his attention. "You said 'very bad," she said. "How bad is that?"
The instructor said patiently, "In the last fiscal orbit about three out of ten Fives came back. Those are the biggest ships. In several cases the crews were dead when we got them open, even so."
"Yeah," said Sheri, "that's very bad."
"No, that's not bad at all, compared to the one-man ships. Two orbits ago we went a whole orbit and only two Ones came back at all. That's bad."
"Why is that?" asked the father of the tunnel-rat family. Their name was Forehand. The instructor looked at him for a moment.
"If you ever find out," he said, "be sure and tell somebody. Now. As far as selecting a crew is concerned, you're better off if you can get somebody who's already been out. Maybe you can, maybe you can't. Prospectors who strike it rich generally quit; the ones that are still hungry may not want to break up their teams. So a lot of you fish are going to have to go out with other virgins. Umm." He looked around thoughtfully. "Well, let's get our feet wet. Sort yourselves out into groups of three — don't worry about who's in your group, this isn't where you pick your partners — and climb into one of those open landers. Don't touch anything. They're supposed to be in deactive mode, but I have to tell you they don't always stay deactive. Just go in, climb down to the control cabin and wait for an instructor to join you."
That was the first I'd heard that there were other instructors. I looked around, trying to work out which were teachers and which were fish, while he said, "Are there any questions?"
Sheri again. "Yeah. What's your name?"
"Did I forget that again? I'm Jimmy Chou. Pleased to meet you all. Now let's go."
Now I know a lot more than my instructor did, including what happened to him half an orbit later — poor old Jimmy Chou, he went out before I