In which the Nautilus voyages through the Pacific, revealing the slow, majestic labour of microscopic coral builders in shaping island chains, while the narrator elaborates on the tragic tale of the vanished explorers La Pérouse and his crew. Amidst sunlit seas and coral reefs, Captain Nemo unveils poignant relics and solemn reflections upon shipwrecks long submerged in their tranquil, underwater resting place.