nigelswift wrote:
But of course, the ability of chalk to absorb, retain and slow water is of little significance if there's a big hole for it to flow down....
Yup... Here the (2000) collapse of the shaft walls may have helped, at least it put the thing on the front burner
On 11 May 2007, Skanska, under the direction of English Heritage, began a major program of stabilisation, filling the tunnels and shafts with hundreds of tonnes of chalk. At the same time a new archaeological survey is being conducted using modern equipment and techniques.
^ I'm glad they're using chalk