On 02/02/2014 23:22, Joe Egginton wrote:
A 30ft sinkhole has swallowed a car in High Wycombe, from the photos
there's no water at the bottom so it can't be an underground stream. I
don't think there's any mines around there. So what caused the sink hole?

http://www.bbc.co.uk/news/uk-england...herts-26010192

Horizon BBC2 tonight on the geologically caused ones, tonight
This one probably like the numerous "sink holes" around Reading, due to
prehistoric flint mines collapsing , see Grimes Graves