Rob Bell climbs, crawls, dives and burrows into the amazing world of Underground Britain – in search of our most extraordinary, mysterious and challenging subterranean places, from hidden man-made constructions to stunning natural wonders. This is a journey into the unknown, discovering the other side of the story of Britain as Rob travels from the Highlands to Cornwall to uncover everything from modern engineering challenges to bloody medieval mysteries and weird ancient burials. Each of the six programmes focuses on a different region of Britain, exploring the best and most intriguing underground sites of Scotland, Wales, London, Northern, Central and Southern England.

Three Reader's Digest investigations take us into; Britain's subterranean caves, rivers, tunnels and bunkers from ancient times to the modern era; plus the shelters, secret weapons sites and hidden command centres of WW2; and the bunkers, citadels, and hidden nuclear command centres of Cold War Britain. Uncover the truth behind the secret escape tunnels linking Parliament, Downing Street and Buckingham Palace. Discover Edinburgh’s underground city of caves … hidden from prying eyes for centuries. Explore classified underground establishments built by the Government during World War II. Follow the cameras as these, and many more, mysteries are unravelled before your eyes! From Norman to Victorian times, explore the strange forts, mines, caves, rivers and much more, all previously hidden from our eyes. From Liverpool’s extraordinary Williamson tunnels to disused passages under the Thames, see a side of the past rarely mentioned in the history books!