passed columns of rock which had been left unblasted and which served as buttresses for the layers of rock between the tunnel and the surface. Again this was like the mines on the Moon, except that the buttresses were both thicker and more numerous here, which was reasonable, since Mercury's gravity, small as it was, was two and a half times that of the Moon.
Tunnels branched off the main shaft along which they traveled. Lucky, who seemed in no hurry, paused at each opening in order to compare matters with the chart he carried.
To Bigman, the most melancholy aspect of the mines was the vestiges of one-time human occupancy: the bolts where illumo-plates must once have been attached to keep the corridors blazing with the light of day, the faint markings where paramagnetic relays must once have afforded traction for ore cars, occasional side pockets where rooms or laboratories must have existed, where miners might pause to eat at field kitchens or where samples of ore might be assayed.
All dismantled now, all torn down, only bare rock left.
But Bigman was not the man to brood overlong on such matters. Rather, he grew concerned at the lack of action. He had not come out here merely for the walk.
He said, "Lucky, the ergometer doesn't show a thing."
"I know, Bigman. Cover."
He said it quietly, with no special emphasis, but Bigman knew what it meant. He shoved his radio control to the particular notch which activated a shield for the carrier wave and scrambled the message. It was not regulation equipment on a space-suit, but it was routine for Lucky and Bigman. Bigman had added the scrambler to the radio controls when preparing the suits almost without giving the matter a conscious thought.
Bigman's heart was beating a little faster. When Lucky called for a tight, scrambled beam between the two of them, danger was near. Nearer, at any rate. He said, "What's up, Lucky?"
"It's time to talk." Lucky's voice had a faintly far-off sound, as though it was coming indeterminately from all directions. That was due to the inevitable lack of perfection of the part of the receiving unscrambler, which always left a small fraction of "noise."
Lucky said, "This is Tunnel 7a, according to the chart. It leads back by a fairly simple route to one of the vertical shafts leading to the surface. I'll be going there."
Bigman said, amazed, "You will? Why, Lucky?"
"To get to the surface," and Lucky laughed lightly. "Why else?"
"What for?"
"In order to travel along the surface to the hangar and the
Shooting Starr.
When I went to the ship last time, I took the new inso-suit with me."
Bigman chewed that over and said slowly, "Does that mean you'll be heading for Sun-side?"
"Right. I'll be heading for the big Sun. I can't get lost, at least, since I need only follow the coronal glow on the horizon. It makes it very simple."
"Come off it, Lucky, will you? I thought it was the mines that have the Sirians in them. Didn't you prove that at the banquet?"
"No, Bigman, I didn't prove it. I just fast-talked it into sounding as though it were proven."
"Then why didn't you say so to me?"
"Because we've argued this out before, I don't want to go into it. I can't risk your losing your temper at the wrong time. If I had told you our coming down here was part of a deeper plan and if, for any reason, Cook had irritated you, you might have blurted it right out."
"I would not, Lucky. It's just that you hate to say anything at all till you're all ready."
"There's that too," admitted Lucky. "Anyway, that's the situation. I wanted everyone to think I was going into the mines. I wanted everyone to think I hadn't the foggiest notion of heading for Sun-side. The safest way of seeing to it was to make sure nobody, but nobody, not even you, Bigman, thought any differently."
"Can you tell me why, Lucky? Or is that still all a big secret?"
"I can tell you this. I have a strong notion that someone at the Dome is behind the sabotage. I don't believe in the Sirian
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