If I was, I should try to be civil to them. More than civil. Living, the three of us, for three weeks in a space about as big as an apartment kitchenette meant that everybody would have to work real hard at being nice to everybody else, if we were going to come back without total hatred. And as I was the one who was being paid to be nice, I should be the one to set an example.
On the other hand, the Cochenours of the world are sometimes just not likable. If that was going to be the case, the less talk the better, and I should slide questions like that off with something like, 'I forgot.'
But he hadn't actually gone out of his way to be unpleasant. The girl had even actually attempted friendliness. So I opted for courtesy. 'Well, that's an interesting thing. You see, you hear by differences in pressure. While the airbody was taking off, the plugs filtered out part of the sound-the pressure waves-but when I yelled at you to belt up, the plugs passed the overpressure of my voice and you could hear easily enough. However, there's a limit. Past about a hundred and twenty decibels-that's a unit of sound-'
'I know what a decibel is,' Cochenour growled.
'Right. Past a hundred and twenty or so the eardrum just doesn't respond anymore. So in the crawler it was just too loud. You not only got sound in through the hull, it came up from the ground, conducted by the treads. If you'd had the plugs in you wouldn't even have been able to hear-well, anything at all,' I finished lamely.
Dorotha had been listening while she repaired her eye makeup. 'Anything like what?' she demanded.
I decided to think of them as friends, at least for the time being. 'Like orders to get into your heatsuits. In case of accident, I mean. A gust could've tipped that crawler right over, or sometimes solid
objects come flying over the hills and hit you before you know it.' She was shaking her head, but she was laughing. 'Lovely place
you took us to, Boyce,' she commented.
He wasn't paying any attentiOn. He had something else on his mind. 'Why aren't you flying this thing?' he demanded.
I got up and activated the virtual globe. 'Right,' I said. 'It's time we talked about that. Just now my airbody's on autopilot, heading in the general direction of this quadrant down here. We have to decide on a specific destination.'
Dorrie Keefer was inspecting the globe. It isn't real, of course; it's just a three-dimensional image that hangs in the air, and you can poke your finger right through it. 'Venus doesn't really look like much,' she commented.
'Those lines you see,' I explained, 'are just radio-range markers; you won't see them looking out the window. Venus doesn't
have any oceans, and it isn't cut up into countries, so making a map of it isn't quite what you'd expect on Earth. See this bright spot here? That's us. Now look.'
I overlaid the radio-range grid and the contour colors with geological data. 'Those blobby circles are mascon markers. You know what a mascon is?'
'A concentration of mass. A lump of heavy stuff,' she offered.
'Fine. Now see what happens when I phase in the locations of known Heechee digs.'
When I hit the control the digs appeared as golden patterns, like worms crawling across the planet. Dorotha said at once, 'They're all in the mascons.'
Cochenour gave her a look of approval, and so did I. 'Not quite all,' I corrected. 'But damn near. Why? I don't know. Nobody knows. The mascons are mostly older, denser rock-basalt and so on-and maybe the Heechee felt safer with strong, dense rock around them.' In my correspondence with Professor Hegramet back on Earth, in the days when I didn't have a dying liver in my gut and thus could afford to take an interest in abstract knowledge, we had kicked around the possibility that the Heechee digging machines would only work in dense rock, or rock of a certain chemical composition. But I wasn't prepared to discuss some of the ideas I'd gotten from Professor Hegramet with them.
I rotated the virtual globe slightly by turning a dial. 'See over here, where we are now. This formation's Alpha Regio. There's the big digging which we just came out of. You can see the shape of the Spindle. That particular mascon where the Spindle is is called Serendip; it was discovered by a hesperological-'
'Hesperological?'
'By a geological team studying Venus, which makes it a hesperological team. They detected the mass concentration from orbit, then after the landings they drilled out a core sample there and hit the first Heechee dig. Now these other digs you see in the northern high latitudes are all in this one bunch of associated mascons. There
are interventions of less dense rock between them, and they tunnel right through to connect, but they're almost all right in the mascons.
'They're all north,' Cochenour said sharply. 'We're going south. Why?'
It was interesting that he could read the virtual globe, but I didn't say so. I only said, 'The ones that are marked are no good. They've been probed already.'
'Some of them look even bigger than the Spindle.'
'A hell of a lot bigger, right. But there's nothing much in them, or anyway not much chance that anything in them is in good enough shape to bother with. Subsurface fluids filled them up a hundred thousand years ago, maybe more. A lot of good men have gone broke trying to pump one out and excavate, without finding anything. Ask me. I was one of them.'
'I didn't know Venus had any liquid water,' Cochenour objected.
'I didn't say water, did I? But as a matter of fact some of it was, or anyway a sort of oozy mud. Apparently water cooks out oc the rocks and has a transit time, getting to the surface, of some thousands of years before it seeps out, boils off, and cracks to hydrogen and oxygen and gets lost. In case you didn't know it, there's some under the Spindle. It's what you were drinking, and what you were breathing, while you were there.'
'We weren't breathing water,' he corrected.
'No, of course not. We were breathing air that we made. But sometimes the tunnels still have kept their air-I mean the original stuff, the air the Heechee left behind them. Of course, after a few hundred thousand years they generally turn into ovens. Then they tend to bake everything organic away. Maybe that's why we've found so little of, let's say, animal remains-they've been cremated. So-sometimes you might find air in a dig, but I've never heard
