A weekly series of films taken by travellers and explorers; on their expeditions throughout the world.

June Toulmin explores one of the wonders of the ancient world, a tunnel through a mountain on the tiny island of Samos which was constructed 2,500 years ago on the orders of Polycrates, a pirate chief, to bring fresh water to his fortress by the harbour.
Made with the co-operation of the Nuffield Foundation Unit for the History of Ideas
See page 47