He reached the last long gallery on which the ship-lock opened. He saw the broad white ribbon of many strands of light, reaching away seemingly without limit. And he saw a tiny figure running toward him. It was Sandy. She staggered as she ran. She had already run past endurance, but she kept desperately on. Burke broke into a run himself.

When he met her, she gasped, "Pam! She—vanished—down below! We were—looking, and Pam cried out. We ran to her. Gone! And we—heard noises! Noises! Holmes is searching now. She—screamed, Joe!"

Burke swung her behind him.

"Tell Keller," he commanded harshly. "You've got that hand-weapon? Hold on to it! Bring Keller! We'll all search! Hurry!"

He broke into a dead run.

It might have seemed ironic that he should rush to help Sandy's sister in whatever disaster had befallen her when they were facing the end of the whole solar system. In cold blood, it couldn't be considered to matter. But Burke ran.

He panted when he plunged down the ramp to the lower portions of the asteroid. He reached the huge cavern in which the motionless power-generator towered storeys high toward a light-laced ceiling.

"Holmes!" he shouted, and ran on. "Holmes!"

He'd been no farther than this, before, but he went on into tunnels with only double lines of light-tubes overhead, and he shouted and heard his own voice reverberating in a manner which seemed pure mockery. But as he ran he continued to shout.

And presently Holmes shouted in return. There was a process of untangling innumerable echoes, and ultimately they met. Holmes was deathly white. He carried something unbelievable in his hands.