ractised your power. Experience will be necessary before
you can compete with the simplest effort of one of our race._

Dark turned to Maya.

"He's right," said Dark. "I do have extrasensory powers, but they'll
need some development."

"I know," said Maya. "The telepathic voltage in the atmosphere must be
very high right now, because even I sensed your effort in lifting that
object, and I understood Qril's communication to you."

Maya and Dark took their leave of Qril, and went back into Ultra Vires.
As they did so, Qril and the other Martians arose and began to drift
away into the desert, as though they had had a mission in staying here,
which was now accomplished.

"I hope you know something about mechanics," said Maya as they walked
down the corridor together. "Because if you don't, it looks like we're
stuck here for a while. At least I am, unless you can run one of these
groundcars with psychokinetic power."

"No, apparently I'm not that good at it yet," said Dark. "Maybe I could
teleport in any parts you need. No wait! I just remembered something!
Come with me."

They turned off into a side corridor, found stairs and climbed to the
top floor of the building. There they followed another corridor until
Dark stopped and opened a door.

It was the door to a small airlock. Dark led Maya through it into a huge
room.

A helicopter stood in its center.

"Goat _did_ leave it here!" exclaimed Dark joyfully. "I'd forgotten that
he had this. He must have just packed the most necessary things when he
left the place, planning to send trucks and a crew back and clean it out
later at his leisure. Now, if this copter's only in good flying shape,
we're set."

He checked the machine over. Everything was in order.

"How do we get it out of here?" asked Maya curiously, looking around the
room. "That little airlock's too small for a copter to go through it."

"The roof rolls back," said Dark. "Put on your helmet, and I'll show
you."

Maya donned her marshelmet. Dark went to the wall and pulled a switch.
Nothing happened.

"I forgot," he said. "The electricity's off. Well, let's try something."

Dark concentrated his mind intensely on the movable ceiling. For a
moment, there was resistance, then, very slowly, it began to open. A
crack appeared in its center, and the air of the room hissed out with
the swish of a minor tempest. After that, it was easier. The crack
widened swiftly, and the roof rolled back to the walls