Outside broadcast cameras return to Silbury to see the results of the final three weeks' excavation. At the end of July's Chronicle Professor Richard Atkinson was about to investigate the pit lying in the last four feet of untouched material, between the end of the tunnel and the geometrical centre of Silbury's inner mound. Tonight's programme shows whether these closing days of skill and patience have revealed the ultimate truth about Silbury Hill and provided answers to all the questions Professor Atkinson posed before the dig began two years ago.