It is one of the founding stories of Western civilisation - the epic journey home to Ithaca by Odysseus following his victory in the Trojan War. It has long been argued whether Homer's tale is pure myth. Now British businessman Robert Bittlestone has set out to prove that the Greek hero's homeland does exist. But his controversial hunch about Ithaca's actual location would only make sense by showing the region had been transformed, possibly by a massive earthquake. So in October 2006, he set out to prove his theory by drilling a borehole on the Greek island of Kefallonia - with Channel Four News having exclusive access to the project.