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


I saw the pictures on TV tonight. There was (half) a ring of stones at
the edge of of the hole, so I'm guessing that might have been a manhole
cover. If so, manhole leaks, water from leak percolates into the clay
over a number of years, waterlogged clay seeps away through limestone,
hole is created, oops.

jim, Northampton