Plot

New discoveries uncover how the Romans ruled the seas for four centuries.

The Roman Empire dominated millions of miles of land -- and sea. What secrets powered its rule over the waves for four centuries? We follow archaeologists as they plunge underwater to excavate a newly discovered 1st-century Roman shipwreck, explore long-lost ports in Italy's bay of Naples, and reconstruct and race two ancient Roman ships to unravel the maritime mastery that anchored an empire.