With reference to the eruption of Mount Vesuvius that destroyed the cities of Pompeii and Herculaneum, investigators hunt for clues hidden beneath the surface to assess the risk of a new and potentially devastating event of equal magnitude. This documentary follows historians and geologists as they discover the latest evidence of Pompeii's fiery destruction, unpacking the chain of events that led to the ancient world's most notorious disaster in AD 79. What lessons does the tragedy of Pompeii hold for Naples' citizens, who face a mounting threat from the unseen forces beneath their feet?