A few weeks later, Herbert and Elena are sunning outside when they notice a rivulet of honey. Atop a rocky bluff, they come across an enormous hive inhabited by giant bees, which attack them. As Herbert and Elena escape from the hive into a large flooded cave, they spot the submarine "Nautilus" inside. They enter the vessel, but knowing that it belongs to someone else, retreat, swimming out of the cave. Meanwhile, Harding, Spillet, Neb, Mary and Pencroft spot an approaching pirate ship. They try to hide, but are discovered, and a fight with the pirates ensues. The castaways prevail only after an explosion mysteriously sinks the pirate ship with all hands aboard.