The Lost World Chapter 15 - Our Eyes have seen Great Wonders

In which the explorers, though masters of the plateau after their victory over the ape-men, find themselves held captive by the very natives who aided them, while Challenger seeks inventive means for their descent, including a remarkable gas-bag contraption. Through a secret message and cautious exploration, they discover a hidden cave passage that might offer escape, setting the stage for their departure from this strange and primeval land.