Underneath Bristol lies a 190-million-year-old Jurassic cave system more than 200ft down which has claimed the lives of two climbers in the past - and some do not know it is there
Inside Pen Park Hole caves and lake hidden under Bristol suburb 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.