"Very well, sir," said Tom. "I guess that is best. Ready to go, Astro?"

"Ready," replied the big cadet.

"Good-by, Major," said Tom, reaching into the doorway to shake hands with Connel. "I'll try my best."

"It's a matter of life and death, Tom." Connel's voice was low and husky. "Not our lives, or the lives of a few people, but the life and death of the Solar Alliance."

"I understand, sir." Tom turned to Astro and the two cadets marched off quickly.

They had no difficulty finding the giant ship on the cradles outside the repair shop and quickly turned toward the base of the cliff. Twenty minutes later they had left the center of activity and were close to the canyon wall. They were congratulating themselves on their luck in not being stopped or questioned when suddenly they saw a guard ahead of them on sentry duty.

"Ill take care of him," whispered Astro. "You hide here in the shadows, and when I whistle, you start climbing. Then I'll cover you from there until you get to the top. Got it?"

"Right!" The two cadets shook hands briefly. Each knew that there was no need to speak of their feelings. "Take care of Roger," said Tom. "We don't know how badly he's been injured."

"I'll see to him," said Astro. "Watch me now and wait for my whistle." He turned away and then paused to call back softly, "Spaceman's luck, Tom."

"Same to you, Astro," replied Tom, and then crouched tensely in the shadows.