New sinkhole in Hemel Hempsted

[Brains]

http://www.bbc.co.uk/news/uk-england-beds-bucks-herts-26206764
BBC item about a shakehole under a house. Brief web search shows the area is on chalk, and has underground workings for the same which have collapsed in the past giving other shakeholes. There are also natural chalk swallow holes in the vicinity...

 

[Laurie]

There's a five mile sided triangular warren of dried out chalk aquifers under Brighton.
Are they next?

 

[Slug]

http://www.bbc.co.uk/news/uk-england-beds-bucks-herts-26224207

....and again....

 

[Subpopulus Hibernia]

http://www.rte.ie/news/2014/0217/504857-sinkhole/

?yet again once more...