Extreme Archaeology S01 E07 Shetland Fortress

The team returns to the Shetland Islands, this time to investigate an iron age fortress known as Burgi Geos. Just getting the site proves a nightmare as the crew must cross some of the deepest peat bogs in Europe. As the team begins investigations it becomes more apparent that the site was far more than a simple fort. But why was there a community to protect in the first place.