At the corridor’s end the old man halted before a heavy door, which after considerable difficulty he managed to open.
“Wait a moment,” he said, “until I find a cresset and make a light.”
They heard him moving about beyond the doorway for a moment and then a dim light flared, and presently the wick in a cresset flickered. In the dim rays Tarzan saw before them a large rectangular chamber, the great size of which was only partially suggested in the wavering light of the cresset.
“Get them all in,” said the old man, “and close the door;” and when that had been done he called to Tarzan. “Come!” he said. “Before we leave this chamber I want to show you such a sight as no other human eyes have ever rested upon.”
He led him to the far side of the chamber where, in the light of the cresset, Tarzan saw tier after tier of shelves, upon which were stacked small sacks made of skins. The old man set the cresset upon one of the shelves and taking a sack opened it and spilled a portion of the contents into the palm of his hand. “Diamonds,” he said. “Each of these packages weighs five pounds and each contains diamonds. They have been accumulating them for countless ages, for they mine far more than they can use themselves. In their legends is the belief that some day the Atlantians will return and they can sell the diamonds to them. And so they continue to mine them and store them as though there was a constant and ready market for them. Here, take one of the bags with you,” he said. He handed one to Tarzan and another to La.
“I do not believe that we shall ever leave the valley alive, but we might;” and he took a third bag for himself.
From the diamond vault the old man led them up a primitive ladder to the floor above, and quickly to the main entrance of the Tower. Only two heavy doors, bolted upon the inside, now lay between them and the terrace, a short distance beyond which the east gate swung open. The old man was about to open the doors when Tarzan stopped him.
“Wait a moment,” he said, “until the rest of the Gomangani come. It takes them some time to ascend the ladder. When they are all here behind us, swing the doors open, and you and La, with this ten or a dozen Gomangani that are immediately around us, make a break for the gate. The rest of us will bring up the rear and hold the Bolgani off in case they attack us. Get ready,” he added a moment later, “I think they are all up.”
Carefully Tarzan explained to the Gomangani the plan he had in mind, and then, turning to the old man, he commanded “Now!” The bolt slipped, the doors swung open, and simultaneously the entire party started at a run toward the east gate.
The Bolgani, who were still massed about the throne room, were not aware that their victims had eluded them until Tarzan, bringing up the rear with Jad-bal-ja was passing through the east gate. Then the Bolgani discovered him, and immediately set up a hue and cry that brought several hundred of them on a mad run in pursuit.