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Chronicle filmed excavations at the Silbury Mound from 1968 to 1970, one of the largest operations mounted by the programme. This 1968 dig was not, however, the first attempt to uncover the secrets of Silbury Hill. The Duke of Northumberland sank a shaft into the mound in 1777. A tunnel was dug in 1849, while in 1922, Sir William Flinders Petrie cut a large trench into the base of the mound. This trench was reopened and re-examined as part of the Chronicle series in 1969.

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