Digging with their fingers was slow and laborious work, but they kept steadily at it, taking turns about. The man at work would push the dirt behind him and the others would gather it up and distribute it, so that at no time was there a fresh pile of earth upon the ground to attract attention should a Horib come. Horibs did come; they brought food, but the men could hear the splash of their bodies in the water as they dove into the lake to reach the tunnel leading to the cave and being thus warned they grouped themselves in front of the entrance to their tunnel effectually hiding it from view. The Horibs who came into the chamber at no time gave any suggestion of suspicion that all was not right. While it was apparent that they could see in the dark it was also quite evident that they could not discern things clearly and thus the greatest fear that their plot might be discovered was at least partially removed. After considerable effort they had succeeded in excavating a tunnel some three feet in diameter and about ten feet long when Jason, who was excavating at the time, unearthed a large shell, which greatly facilitated the process of excavation. From then on their advance was more rapid, yet it seemed to them all that it was an endless job; nor was there any telling at what moment the Horibs would come to take them for the feast. It was Jason's wish to get well within the forest before turning their course upward toward the surface, but to be certain of this he knew that they must first encounter roots of trees and pass beyond them, which might necessitate a detour and delay; yet to come up prematurely would be to nullify all that they had accomplished so far and to put a definite end to all hope of escape. And while the five men dug beneath the ground in the dark hole that was stretching slowly out beneath the dismal forest of the Horibs a great ship rode majestically high in air above the northern slopes of the Mountains of the Thipdars. "They never passed this way," said Zuppner. "Nothing short of a mountain goat could cross this range." "I quite agree with you, sir," said Hines. "We might as well search in some other direction now." "God!" exclaimed Zuppner, "if I only knew in what direction to search." Hines shook his head. "One direction is as good as another, sir," he said. "I suppose so," said Zuppner, and, obeying his light touch upon the helm, the nose of the great dirigible swung to port. Following an easterly course she paralleled the Mountains of the Thipdars and sailed out over the Gyor Cors. A slight turn of the wheel would have carried her to the southeast, across the dismal forest through whose gloomy corridors Tarzan and Jana were being borne to a horrible fate. But Captain Zuppner did not know and so the O-220 continued on toward the east, while the Lord of the Jungle and The Red Flower of Zoram rode silently toward their doom.