Examines the network of underground pipes and tunnels that carry human waste (and more) away. From ancient Rome's pristine sewage-conveying systems, through the foul, out-the-window system of Europe in the Middle Ages, to the revolutionary sanitation engineering of the 19th and 20th centuries, SEWERS flows through history. Study waste management's evolution from the sewers of Paris, Boston, and Los Angeles. Meet a sewer diver (and his robotic counterpart) who inspects and ensures the efficient operation of the conduits.

Originally broadcast as a segment of the television series Modern marvels on the History Channel.