Off the coast of the Gaza Strip fishermen have been discovering coins of extreme rarity and importance. They date from the brief reign of Alexander the Great in the Third Century BC. Strangely, months later, a collection of very very similar coins were sold in a London auction house. What's the story here? Were they illegally trafficked? And what does that tell us about the antiquities found in some of the world's most troubled regions? I talked to Sarah Saey a lead producer for the BBC who broke this story, and also to producer Hazem Balousha in Gaza itself. It is a fascinating piece of archaeological sleuthing that took me from the chaos following the death of Alexander to the modern antiquities trade....