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Thursday 8 August Home Ground - The Hill With The Hole Thanks to Andy Geldard at Skanska who alerted Foresight to this programme which investigates a hole which appeared at the top of a Neolithic site, Silbury Hill in Wiltshire. Mapping the inside of the hole using Skanska technology, 3D images reveal disused mine shafts from the 1700's and 1960's which caused the hole.