It was still just inside the shade when they finished, four hours later. Hargedon had joined them during the final hour and helped pack the equipment in the tractor he was to drive. Zaino had had no trouble in learning to make the observations Schlossberg wanted, and the youngster was almost unbearably cocky. Schlossberg hoped, as they returned to the Albireo, that no one would murder the communications expert in the next twelve hours. There would be nothing to worry about after the trip started; Hargedon was quite able to keep anyone in his place without being nasty about it. If Zaino had been going with Aiello or Harmon—but he wasn’t, and it was pointless to dream up trouble.
And no trouble developed all by itself.
Zaino was not only still alive but still reasonably popular when the first of the tractors set out, carrying Eileen Harmon and Eric Trackman, the Albireo’s nuclear engineer.
It started more than an hour before the others, since the stratigrapher’s drilling program, “done” or not, took extra time. The tractor hummed off to the south, since both Darkside routes required a long detour to pass the chasm to the west. Routes had been worked out from the stereo-photos taken during the orbital survey. Even Darkside had been covered fairly well with Uniquantum film under Venus light.
The Harmon-Trackman vehicle ‘Was well out of sight when Mardikian and Aiello started out on one of the Brightside routes, and a few minutes later Marini set out on the other with the space-unit technician, Mary Spun, driving.
Both vehicles disappeared quickly into a valley to the northeast, between the ash cones and a thousand-foot spine which rose just south of them. All the tractors were in good radio contact; Zaino made sure of that before he abandoned the radio watch to Rowson, suited up and joined Hargedon at the remaining one. They climbed in, and Hargedon set it in motion.
At about the same time, the first tractor came into view again, now traveling north on the farther side of the chasm. Hargedon took this as evidence that the route thus far was unchanged, and kicked in highest speed.
The cabin was pretty cramped, even though some of the equipment had been attached outside. The men could not expect much comfort for the next week.
Hargedon was used to the trips, however. He disapproved on principle of people who complained about minor inconveniences such as having to sleep in space suits; fortunately, Zaino’s interest and excitement overrode any thought he might have had about discomfort.
This lasted through the time they spent doubling the vast crack in Mercury’s crust, driving on a little to the north of the ship on the other side and then turning west toward the dark hemisphere. The route was identical to that of Harmon’s machine for some time, though no trace of its passage showed on the hard surface. Then Hargedon angled off toward the southwest. He had driven this run often enough to know it well even without the markers which had been set out with the seismographs. The photographic maps were also aboard. With them, even Zaino had no trouble keeping track of their progress while they remained in sunlight.
However, the sun sank as they traveled west. In two hours its lower rim would have been on the horizon, had they been able to see the horizon; as it was, more of the “sea level” lava plain was in shadow than not even near the ship, and their route now lay in semidarkness.
The light came from peaks projecting into the sunlight, from scattered skylight which was growing rapidly fainter and from the brighter celestial objects such as Earth. Even with the tractor’s lights it was getting harder to spot crevasses and seismometer markers. Zaino quickly found the fun wearing off . . . though his pride made him cover the fact as best he could.
If Hargedon saw this, he said nothing. He set Zaino to picking up every other instrument, as any partner would have, making no allowance for the work the youngster was doing for Schlossberg. This might, of course, have had the purpose of keeping the radioman too busy to think about discomfort. Or it might merely have been Hargedon’s idea of normal procedure.
Whatever the cause, Zaino got little chance to use the radio once they had driven into the darkness. He managed only one or two brief talks with those left at the ship.
The talks might have helped his morale, since they certainly must have given the impression that nothing was going on in the ship while at least he had something to do in the tractor. However, this state of affairs did not last. Before the vehicle was four hours out of sight of the Albireo, a broadcast by Camille Burkett reached them.
The mineralogist’s voice contained at least as much professional enthusiasm as alarm, but everyone listening must have thought promptly of the dubious stability of Mercury’s crust. The call was intended for her fellow geologists Mardikian and Harmon. But it interested Zaino at least as much.
“Joe! Eileen! There’s a column of what looks like black smoke rising over Northeast Spur. It can’t be a real fire, of course; I can’t see its point of origin, but if it’s the convection current it seems to me the source must be pretty hot. It’s the closest thing to a genuine volcano I’ve seen since we arrived; it’s certainly not another of those ash mounds. I should think you’d still be close enough to make it out, Joe. Can you see anything?”
The reply from Mardikian’s tractor was inaudible to Zaino and Hargedon, but Burkett’s answer made its general tenor plain.
“I hadn’t thought of that. Yes, I’d say it was pretty close to the Brightside route. It wouldn’t be practical for you to stop your run now to come back to see. You couldn’t do much about it anyway. I could go out to have a look and then report to you. If the way back is blocked there’ll be plenty of time to work out another.” Hargedon and Zaino passed questioning glances at each other during the shorter pause that followed.
“I know there aren’t,” the voice then went on, responding to the words they could not hear, “but it’s only two or three miles, I’d say. Two to the spur and not much farther to where I could see the other side. Enough of the way is in shade so I could make it in a suit easily enough. I can’t see calling back either of the Darkside tractors. Their work is just as important as the rest—anyway, Eileen is probably out of range. She hasn’t answered yet.”
Another pause.
“That’s true. Still, it would mean sacrificing that set of seismic records—no, wait. We could go out later for those. And Mel could take his own weather measures on the later trip. There’s plenty of time!”
Pause, longer this time.
“You’re right, of course. I just wanted to get an early look at this volcano, if it is one. We’ll let the others finish their runs, and when you get back you can check the thing from the other side yourself. If it is blocking your way there’s time to find an alternate route. We could be doing that from the maps in the meantime, just in case.”
Zaino looked at his companion.
“Isn’t that just my luck!” he exclaimed. “I jump at the first chance to get away from being bored to death. The minute I’m safely away, the only interesting thing of the whole operation happens—back at the ship!”
“Who asked to come on this trip?”
“Oh, I’m not blaming anyone but myself. If I’d stayed back there the volcano would have popped out here somewhere, or else waited until we were gone.”
“If it is a volcano. Dr. Burkett didn’t seem quite sure.” “No, and I’ll bet a nickel she’s suiting up right now to go out and see. I hope she comes back with something while we’re still near enough to hear about it.”
Hargedon shrugged. “I suppose it was also just your luck that sent you on a Darkside trip? You know the radio stuff. You knew we couldn’t reach as far this way with the radios. Didn’t you think of that in advance?”