David Stephenson said he went down with a couple of friends in 1999 and came back after making some astonishing discoveries, including stables for an old Co-op and World War 2 air raid shelter.
Charfield - famous for a rail disaster - is divided over new railway station plans bristolpost.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from bristolpost.co.uk Daily Mail and Mail on Sunday newspapers.