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EH are doing everything they can as fast as they can - there is a meeting at the end of Feb.....the minutes will be posted around June at the earliest…

Personally, I know longer think their seeming inactivity matters as much as their threatened activity – which is far more dangerous because if they re-dig those tunnels they will add more faults than they can correct.

My personal opinion is that while the 68 tunnel is now known to be well compacted to a depth of 4m, beyond this there are voids but they are migrating very slowly towards the outside. We don't know how many or how large, but we do know that they are at great depth and the material above and to the side is holding it back and stopping it moving at any speed. Even if the voids did reach the surface the maximum area it can affect is less than the material from the trench they dug for the water pipe. I therefore think that as the risk is low there is enough time to attempt to monitor the stability whilst getting more comprehensive information about the voids over the next 5 or even 10 years. More information re grouting or improved compounds may become available in this time so this option should not be ignored, what needs to be stopped is research because the opportunity is supposedly there.

But what do I know, I'm pissed (and not a lady doing ladies' things; there is no nuts in the chocolate cake etc).

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"Personally, I know longer think their seeming inactivity matters as much as their threatened activity"

Spot on, IMO. Nice phrase.
I think that's something that needs to be understood.

"Even if the voids did reach the surface the maximum area it can affect is less than the material from the trench they dug for the water pipe."
I've not seen anything that suggests that to me, and everything to suggest the reverse. You've compared area with volume for one thing (tho' I forgive you if you're pissed) and both the area and volume of the material that's at risk of collapsing from the surface seems to be of a different scale entirely on the papers I've seen.

I guess you've seen stuff I haven't though. But it's strange isn't it - everything's vague and unmeasurable and potentially huge, except for the fact that the surface collapse can be accurately given, and it's small. Hmmmm.

"what needs to be stopped is research because the opportunity is supposedly there"

... or at least, that the research donkey doesn't get to ride the repair horse ...
Maybe a better sound bite might be - "Silbury must be kept an agenda free zone..."

>Personally, I know longer think their seeming inactivity matters as much as their threatened activity – which is far more dangerous because if they re-dig those tunnels they will add more faults than they can correct.

Award that Historian a sheep!
Bloody well said!
PeteG