  Timewatch  has exclusive access to the investigation conducted by the National Museum of Ireland. The bodies of  Old Croghan Man  and  Clonycavan Man  were preserved for 2300 years in an Irish peat bog and discovered within weeks of one another. Forensic evidence reveals much about their diet, social status, even hairstyle. It also gives brutal evidence that life -- and death -- in the Iron Age could be vicious.