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An Unfortunate Legacy

The hole on top of Silbury Hill Aerial photograph of the hole on top of the hill in 2000
© English Heritage NMR
 
This intriguing mound has long proved to be an archaeological enigma.  No doubt spurred on by stories of rich burials, antiquarians and archaeologists have dug at least three separate tunnels into the centre. The hole in close up Polystyrene filling of the crater at the top of the hill
© English Heritage NMR
 

In 1776 Hugh Percy, duke of Northumberland, financially supported an excavation by Edward Drax, who directed a group of miners to dig a vertical shaft from the summit to the centre of the hill.  They failed to find the central burial they had expected.

Later, in 1849, John Merewether, the dean of Hereford, oversaw the excavation of a horizontal tunnel into hill.  Again, no central burial was discovered but organic remains including decayed moss and turf were found.

Professor Richard Atkinson led a third major investigation between 1968 and 1970.  Sponsored by the BBC, it was the first excavation to be televised as it progressed.  Atkinson excavated another tunnel on a similar line to Merewether's and identified three phases of construction.

Not one of these tunnels was fully backfilled, leaving an unfortunate legacy.  In May 2000 the full consequence of this was made clear when a 14 metre deep crater unexpectedly opened on the summit.  Further survey showed that the tunnels inside were collapsing. Having temporarily filled the crater with polystyrene, something had to be done to stabilise the hill.

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