When they reach the other side of the island, they encounter a giant crab. After Neb is nearly killed, the castaways are able to push it into a boiling geyser and have crab meat for dinner. Afterwards, the men continue exploring and find a herd of wild goats which they try to catch. Then they find two unconscious English ladies, Lady Mary Fairchild and her niece Elena, who were shipwrecked here by the same storm. Working together, the castaways find cover and protection in a cave which they call "Granite House", formerly inhabited by a now deceased castaway named Tom Ayrton. A treasure chest later washes ashore, and in it the men find a variety of useful items, including rifles, nautical charts, and books such as "Robinson Crusoe". Markings upon one of the rifles found in the chest indicate that it came from the "Nautilus", upon which Spillet gives Lady Fairchild (who is unfamiliar with the tale) a brief summation of the "Nautilus", its creator Captain Nemo, and its supposed destruction off the coast of Mexico some eight years earlier. Spillet expresses a sense of respect and admiration for Nemo's genius and principles against war, while Harding derides him for being a madman and a murderer, condemning him for the deaths of numerous sailors during his crusade. Making use of the charts, the castaways are able to determine their location and proceed with the construction of a boat on which they can escape the island.