Silbury Hill forum 180 room
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"There's an announcement of a supplementary engineering update for later this week"

Yes, but unfortunately the present update "focuses upon the hilltop works" but doesn't mention the shaft at all and the supplementary one later this week will explain "FUTURE progress with the TUNNEL".

So where's the explanation of CURRENT work to the SHAFT ??

So where's the explanation of CURRENT work to the SHAFT ??
There isn't one.

Furthermore, there's no explanation of how the polystyrene will be extracted - and we all know how that stuff behaves when it's broken up. Unless the top of the shaft is covered with a temporary structure (which would also help protect the interior of Silbury from rainfall) there's a strong possibility that pieces of polystyrene will get blown all over the surrounding countryside.

That's just the external problem - more worrying is that the interior of Silbury will be forever contaminated with pieces of polystyrene.