one of the shafts to the opposite side of the mountain, possibly for purposes of ventilation. This tunnel and the trail leading down into Opar are the only means of ingress to the valley. From time immemorial they have kept the tunnel guarded, more particularly, I imagine, to prevent the escape of slaves than to thwart the inroads of an enemy, since they believe that there is no fear of the latter emergency. The trail to Opar they do not guard, because they no longer fear the Oparians, and know quite well that none of their Gomangani slaves would dare enter the valley of the sunworshipers. For the same reason, then, that the slaves cannot escape, we, too, must remain prisoners here forever."
"How is the tunnel guarded?" asked Tarzan.
"Two Bolgani and a dozen or more Gomangani warriors are always upon duty there," replied the old man.
"The Gomangani would like to escape?"
"They have tried it many times in the past, I am told," replied the old man, "though never since I have lived here, and always they were caught and tortured. And all their race was punished and worked the harder because of these attempts upon the part of a few."
"They are numerous—the Gomangani?"
"There are probably five thousand of them in the valley," replied the old man.
"And how many Bolgani?" the ape-man asked.
"Between ten and eleven hundred."
