Antikythera Mechanism is 2000-year-old astronomical computer [audio 29min]

In the first of a new series of "Unearthing Mysteries", Professor Aubrey Manning -- distinguished English zoologist and radio/TV presenter -- travels to Athens to find out about the secrets of a finding which has astonished its investigators. The Antikythera Mechanism is an intricate bronze device of wheels, dials and gears created more than 2000 years ago by the Ancient Greeks. Found at the bottom of the sea by sponge divers on the wreck of a Roman cargo ship, it has fascinated astronomers, mathematicians, engineers and historians ever since. Crafted with precision engineering and covered with astronomical symbols and inscriptions -- was it an early astronomical computer? The sophisticated technology used to make it isn't seen until medieval clocks 1000 years later. Could its existence mean the ancient Greeks knew the Earth moved round the Sun more than a millennia before Copernicus brought it to the world in the 16th century? Aubrey Manning goes in search of who made it, what it was used for and why its existence might mean a rethink of our understanding of the history of science and technology.