Silbury Hill forum 180 room
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If the horizontal and vertical shafts meet up there should be a hell of an updraught, which will help to ventilate and dry the hill out.

...asssuming it's not raining at the time, in which case the water would have a direct line to the most sensitive part of the hill.

A simple tarpaulin cover, properly weighted for windy conditions would be required. And as has been demonstrated over the past couple of weeks, EH haven't thought of that yet.