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"And human life, any kind of human life, doesn't mean much to them, anyway. They're machine-centered. I've watched them with their metal men. They're more considerate of a Sirian robot, almost, than of a Sirian man. They would regard a robot as worth a hundred men of Earth. They pamper those robots. They love them. Nothing's too good for them."

Lucky murmured, "Robots are expensive. They have to be treated carefully."

"Maybe so," said Dr. Peverale, "but men who become accustomed to worrying about the needs of machines become callous about the needs of men."

Lucky Starr leaned forward, elbows on the table, dark eyes serious and the smooth vertical lines of his handsome, still subtly boyish face set gravely. He said, "Dr. Peverale, if the Sirians are race-conscious and are breeding themselves into uniformity, they will defeat themselves in the long run. It is variety in the human race that brings about progress. It is Earth and not Sirius that is in the forefront of scientific research. Earthmen settled Sirius in the first place, and it is we, not our Sirian cousins, who are advancing in new directions every year. Even the positronic robots you mention were invented and developed on Earth by Earthmen."

"Yes," said the astronomer, "but Earthmen don't make use of the robot. It would upset our economy, and we place the comfort and security of today above" the safety of tomorrow. We use our scientific advance to make ourselves weaker. Sinus uses its to make itself stronger. That's the difference and that's the danger."

Dr. Peverale threw himself back in his chair, looking grim. The mechanical tray-carrier cleared the table.

Lucky pointed at it. "That's a sort of a robot, if you like," he said.

The mechanical tray-carrier went quietly about its task. It was a flat-surfaced thing moving smoothly on a diamagnetic field, so that its gently curved base never actually touched the floor. Its limber tentacles removed dishes with careful delicacy, placing some on its upper surface, others within a cabinet in its side.

"That's a simple automaton," snorted Dr. Peverale. "It has no positronic brain. It cannot adapt itself to any change in its task."

"Well, then," said Lucky, "are you saying that the Sirians are sabotaging Project Light?"

"Yes. I am."

"Why should they?"

Dr. Peverale shrugged. "Perhaps it's just part of a larger plan. I don't know what trouble there is elsewhere in the Solar System. These may be the first random probings to prepare for ultimate invasion and conquest Project Light in itself means nothing, the Sirian danger everything. I wish I could rouse the Council of Science and the government and the people to that truth."

Hanley Cook coughed, then spoke for the first time. "The Sirians are human like the rest of us. If they're on the planet, where are they?"

Dr. Peverale said coldly, "That's for an exploring expedition to find out. A well-prepared, well-equipped expedition."

"Wait a minute," said Mindes, his eyes glinting with excitement, "I've been out on the Sun-side, and I'll swear… "

"A well-prepared, well-equipped expedition," repeated the old astronomer firmly. "Your one-man flights mean nothing, Mindes."

The engineer stuttered a moment and slumped into an embarrassed silence.

Lucky said suddenly, "You seem to be unhappy about this, Urteil. What is your opinion of Dr. Pever-ale's view?"

The investigator lifted his eyes and met those of Lucky for a long moment in hatred and open defiance. It was obvious he had not forgotten, nor would forget, the earlier exchange at this table.

He said, "I'm keeping my opinion to myself. But I will say this, I'm not fooled by anything that's going on here tonight."

His mouth clamped shut and Lucky, having waited a moment for further remarks, turned to Peverale and said, "I wonder if we do need a complete expedition, sir. If we suppose that the Sirians are here on Mercury, can we perhaps deduce where they might be?"

"Go ahead, Lucky," crowed Bigman at once. "Show them how."

Dr. Peverale said, "How do you mean?"

"Well, what would be the best for the Sirians? If they've been sabotaging Project Light at frequent intervals over a period of months, it would be most convenient for them to have a base near the project. Yet at the same time, the base must not be easily detected. They've certainly been successful in the second requirement, anyway. Now where could such a handy, but secret, base be?

"Let's divide up Mercury into two parts, Sun-side and dark-side. It seems to me that they would be foolish to set up a base on Sun-side. Too hot, too much radiation, too inhospitable."

Cook grunted. "No more inhospitable than the dark-side."

"No, no," said Lucky at once, "you're wrong there. The Sun-side presents an environment which is quite unusual. Humans aren't accustomed it it at all. The dark-side is something very familiar. It is simply ground which is exposed to space, and the conditions of space are very familiar. The dark-side is cold but no colder than space. It is dark and airless but no darker than any portion of space not in direct sunlight and certainly no more airless. Men have learned to live comfortably in space, and they can live on the dark-side."

"Go on," said Dr. Peverale, his old eyes gleaming with interest. "Go on, Mr. Starr."

"But establishing a base that would serve over a period of months is not a simple thing. They must have a ship or ships to get back to Sirius someday. Or if they're to be picked up by a ship from outside they must still have ample stores of food and water, as well as an energy source. All this takes up room, and yet they must be certain they will not be detected. It leaves only one place where they can be."

"Where, Lucky?" asked Bigman, nearly jumping up and down in his eagerness. He, at least, had no doubts that whatever Lucky said was so. "Where?"

"Well," said Lucky, "when I first arrived here, Dr.Mindes made mention of mines on Mercury which had failed. Just a few moments ago, Dr. Peverale spoke of mines on Mercury that were once working. From that I gather that there must be empty mine shafts and corridors on the planet, and they must be either here or at the South Pole, since the polar regions are the only places where the temperature extremes are not too great. Am I right?"

Cook faltered. "Yes, there are mines here. Before the Observatory was established, the Dome was the mining center."

"Then we're sitting on top of a large empty hole in Mercury. If the Sirians are successfully hiding a large base, where else would it be? There is the direction of danger."

A murmur of appreciation passed around the table, but it was shattered abruptly by Urteil's guttural tones. "All very pretty," he said, "but what does it all come to? What are you going to do about it?"

"Bigman and I," said Lucky, "intend to enter the mines just as soon as we can get ready. If there's anything there, we'll find it."

6. Preparations

Dr. Gardoma said sharply, "Do you intend to go alone?"

"Why not?" interposed Urteil. "The heroics are cheap enough. Of course they'll go alone. There's nothing and nobody there, and they know it."

"Care to join us?" asked Bigman. "If you leave your big mouth behind you can fit into a suit."

"You wouldn't crowd one even with yours," snarled Urteil.

Dr. Gardoma said again, "There's no point in going alone if… "

"A preliminary investigation," said Lucky, "will do no harm. Actually, Urteil may be right. There may be no one there. At the worst, we'll keep in touch with you at the Dome and hope that we can handle any Sirians we meet. Bigman and I are used to handling tight situations."

"Besides which," added Bigman, his gnomish face puckering into a grin, "Lucky and I like tight situations."