Second Ending by James White

muddy ash and large, flat stones which might have once been a highway. Ahead the valley widened to reveal a great, shallow, perfectly circular lake in which black wavelets merged with a rippled glass shoreline in such a way that it was difficult to make out the water's edge. And below the pictured scene a group of winking lights indicated the presence of metal, tremendous quantities of metal.
     
    The find came as a complete surprise to Ross, because he had been directing the expedition toward a one-time city some eighty miles to the north. Obviously this had been a military installation which had been constructed after his time, there being no mention of it in the latest maps. The important thing, however, was the metal which had been made available. Stumbling on it like that was such an incredible piece of good fortune that he couldn't help feeling, illogically perhaps, that more good fortune must follow it.
     
    "Sink a tunnel to a depth of half a mile," Ross directed, trying not to stammer with excitement. "Angle in from a point two hundred yards beyond the water-line to avoid the risk of flooding…"
     
    The digger unit unshipped itself, earth and ashes fountained briefly and it began its slow dive underground. Occasionally it altered direction to avoid large masses of metal, not because it could not go through them but merely in order to save time. It reported back continuously to the four-hundred-miles-distant Ross, by both speech and repeator instruments, and after nearly five hours' burrowing the picture of conditions underground was complete.
     
    The installation had been a missile-launching base, extensive but not very deep. The bomb which had been responsible for the glass-bottomed lake, its force contained and to a great extent directed downward by the surrounding hills, had smashed its underground galleries flat. There were no survivors, but as the indications were that the base had been fully automated this did not bother Ross very much.
     
    "I've been thinking," he said while the digger unit was returning to the surface. "Our construction program should be based on a site where metal is available rather than go through the time-wasting business of transporting it back here. So I'm going to send you as many repair robots as can be spared, and while they are on the way here is what I want done.
     
    "You have absorbed data on open-cast mining," Ross went on briskly, "and your report states that there are large quantities of metal within fifty feet of the surface. I want you to rejoin your transporter unit as quickly as possible and have your repair robots modify it as a bulldozer. When you have uncovered —"
     
    The Sister broke in at that point. "Mr. Ross," she said firmly, "it's time for bed."
     
    Although Ross protested bitterly as he was led down to his room, underneath he was happier and more hopeful than at any other time since his awakening. He was still very far from achieving his goal of searching every square foot of the Earth's surface, but a beginning had been made. He knew the capabilities of his robots, knew that, given the raw material — which was now available — he would have a duplicate Miner built by the end of the week, and the week after that he would have half a dozen of them. The square law, he thought, was wonderful. Compared to what he was going to do the achievements of the first few rabbits in Australia would be as nothing.
     
    He went to sleep dreaming happily of the orders he would have to give next day, next week and next year…
     

10
    As duplicates of the first Miner were completed Ross sent them to investigate the sites of bombed towns and cities in the area, but for Miner One itself he had a special job. The inexplicable feeling of the need for urgency was still with him, as if somewhere, someone who was alive would die if he did not do the right thing quickly. Nevertheless, he sent Number One northward on a mission which did not include a search for human survivors.