Residents have been left horrified after a huge 16-foot deep hole opened up above a ten-mile long tunnel being built for the controversial HS2 high speed rail line.
The hole, which is about 6m (20ft) wide, opened up above part of the Chiltern tunnel in Little Missenden, Bucks.
Anti-HS2 campaigners have said it is evidence that tunnelling on the controversial infrastructure project should stop.
And, local residents are concerned about the risks the hole presents to the safety of communities in the area.
Catherine Bunting, a parish councillor for Great Missenden and Prestwood, said: "Residents want drilling to stop whilst the safety of the aquifer is independently assessed.
