The third building seemed a lean-to banked against the cliff wall, a slanting shed-wall of glassite fifty feet high and two hundred in length. Under it, for months Grantline's bores had dug into the cliff. Braced tunnels were here, penetrating back and downward into the vein of rock.
The work was over. The borers had been dismantled and packed away. At one end of the cliff the mining equipment lay piled in a litter. There was a heap of discarded ore where Grantline had carted and dumped it after his first crude refining process had yielded it as waste. The ore slag lay like gray powder flakes strewn down the cliff. Trucks and ore carts along the ledge stood discarded, mute evidence of the weeks and months of work these helmeted miners had undergone, struggling upon this airless, frowning world.
But now all that was finished. The catalytic ore was sufficiently concentrated. It lay—this treasure—in a seventy foot pile behind the glassite lean-to, with a cage of wires over it and an insulation barrage hiding its presence.
The ore shelter was dark; the other two buildings were lighted. And there were small lights mounted at intervals about the camp and along the edge of the ledge. A spider ladder, with tiny platforms some twenty feet one above the other, hung precariously to the cliff-face. It descended the five hundred feet to the crater floor; and, behind the camp, it mounted the jagged cliff-face to the upper rim height, where a small observatory platform was placed.
Such was the outer aspect of the Grantline Treasure Camp near the beginning of this Lunar night, when, unknown to Grantline and his men, the Planetara with its brigands was approaching. The night was perhaps a sixth advanced. Full night. No breath of cloud to mar the brilliant starry heavens. The quadrant Earth hung poised like a giant mellow moon over Grantline's crater. A bright Earth, yet no air was here on this Lunar surface to spread its light. Only a glow, mingling with the spots of blue tube light on the poles along the cliff, and the radiance from the lighted buildings.
No evidence of movement showed about the silent camp. Then a pressure door in an end of the main building opened its tiny series of locks. A bent figure came out. The lock closed. The figure straightened and gazed about the camp. Grotesque, bloated semblance of a man! Helmeted, with rounded dome hood, suggestion of an ancient sea diver, yet goggled and trunked like a gas-masked fighter of the twentieth century.
He stopped presently and disconnected metal weights which were upon his shoes.
Then he stood erect again, and with giant strides bounded along the cliff. Fantastic figure in the blue lit gloom! A child's dream of crags and rocks and strange lights with a single monstrous figure in seven league boots.
He went the length of the ledge with his twenty foot strides, inspected the lights, and made adjustments. Came back, and climbed with agile, bounding leaps up the spider ladder to the dome of the crater top. A light flashed on up there. Then it was extinguished.
The goggled, bloated figure came leaping down after a moment. Grantline's exterior watchman making his rounds. He came back to the main building. Fastened the weights on his shoes. Signaled.