THE MAIN CAVE OPENED out as they picked their path forward; the walls pressed back, the ceiling lofted, until they were standing in a huge, arched chamber almost two hundred feet wide and half as high. This amphitheater debouched into a half dozen or more smaller corridors or openings; for a moment Captain Lane stood considering these silently, then he nodded toward that on their extreme left.
“Might as well go at it in orderly fashion. We’ll try that one first. No, wait a minute!” He halted Tim, who had pressed obediently toward the corridor-mouth. “Try not to be a groundhog all your life, Mallory! You should know better than to stroll aimlessly around a place like this. A confounded labyrinth, that’s what it is! If we got lost down here, we might spend the rest of our natural lives tryi
