Shandor thought quickly. "This is a Federal Security ship," he snapped. "I'm just on a reconnaissance—"

The voice was cautious. "Security? What's your corroboration number?"

Shandor cursed. "JF223R-864. Name is Jerry Chandler. Give it a check if you want to." He flipped the switch, and accelerated for the ridge of hills that marked the Colorado border as the radio signal continued to bleep angrily, and a trio of pursuit planes on the ground began warming up. Shandor sighed, hoping they would check before they sent ships after him. It might at least delay them until he reached his destination.

Another hour carried him to the heart of the Rockies, and across the great salt fields of Utah. His fuel tanks were low, being emptied one by one as the tiny ship sped through the bright morning sky, and Tom was growing uneasy, until suddenly, far to the west and slightly to the north he spotted the plant, nestling in the mountain foothills. It lay far below, sprawling like some sort of giant spider across the rugged terrain. Several hundred cars spread out to the south of the plant, and he could see others speeding in from the temporary village across the ridge. Everything was quiet, orderly. He could see the shipments, crated, sitting in freight cars to the north. And then he saw the drill line running over to the right of the plant. He followed it, quickly checking a topographical map in the cockpit, and his heart started pounding. The railroad branch ran between two low peaks and curved out toward the desert. Moving over it, he saw the curve, saw it as it cut off to the left—and seemed to stop dead in the middle of the desert sand—

Shandor circled even lower, keeping one ear cocked on the radio, and settled the ship on the railroad line. And just as he cut the motors, he heard the shrill whine of three pursuit ships screaming in from the Eastern horizon—

He was out of the 'copter almost as soon as it had touched, throwing a jacket over his arm, and racing for the place where the drill line ended. Because he had seen as he slid in for a landing, just what he had suspected from the topographical map. The drill didn't end in the middle of a desert at all. It went right on into the mountainside.

The excavation was quite large, the entrance covered and camouflaged neatly to give the very impression that he had gotten from the air. Under the camouflage the space was crowded, stacked with crates, boxes, materials, stacked all along the walls of the tunnel. He followed the rails in, lighting his way with a small pocket flashlight when the tunnel turned a corner, cutting off the daylight. Suddenly the tunnel widened, opening out into a much wider room. He sensed, rather than saw, the immense size of the vault, smelt the odd, bitter odor in the air. With the flashlight he probed the darkness, spotting the high, vaulted ceiling above him. And below him—

At first he couldn't see, probing the vast excavation before him, and then, strangely, he saw but couldn't realize what he saw. He stared for a solid minute, uncomprehending, then, stifling a gasp, he knew what he was looking at—

Lights. He had to have lights, to see clearly what he couldn't believe. Frantically, he spun the flashlight, seeking a light panel, and then, fascinated, he turned the little oval of light back to the pit. And then he heard the barest whisper of sound, the faintest intake of breath, and he ducked, frozen, as a blow whistled past his ear. A second blow from the side caught him solidly in the blackness, grunting, flailing out into a tangle of legs and arms, cursing, catching a foot in his face, striking up into soft, yielding flesh—

And his head suddenly exploded into a million dazzling lights as he sank unconscious to the ground—