The Mysterious Island Part 3 Chapter 13 - Ayrton's Story. A Subterranean Volcano.

In which Ayrton recounts his captivity among the convicts and the mysterious, lightning-like demise of his foes, prompting the colonists to embark on a thorough exploration to find their unseen protector. Their diligent search through the mountain’s caverns and valleys uncovers no trace of this enigmatic benefactor, while the island’s sleeping volcano hints at unrest beneath the surface.