Reread your own vitiolic posts on Heritage Action - you are vehemently against, what you describe (emotively) as 'tunnelling'. At one stage you make claims for a new tunnel - "A new and larger tunnel would be bored into the heart of the mound from the side, involving much disruption to Silbury itself, risk of additional collapse, huge expense and years of further delay."
The volumetric figures you talk about are taken out of context, and again used to back up your own personal preferences for grouting.
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