“One last chance!” exclaimed Rador. He pressed upon the control lever and wrenched it from its socket. Instantly the sparkling ball expanded, whirling with prodigious rapidity and sending a cascade of coruscations into the cylinder. The shell rose; leaped through the air; the dark crystal split into fragments; the fiery ball dulled; died⁠—but upon the impetus of that last thrust we reached the crest. Poised there for a moment, I caught a glimpse of the road dropping down the side of an enormous moss-covered, bowl-shaped valley whose sharply curved sides ended abruptly at the base of the towering barrier.

Then down the steep, powerless to guide or to check the shell, we plunged in a meteor rush straight for the annihilating adamantine breasts of the cliffs!