chris nix is from the london transport museum. what's this exhibition all about, then? these dark, secret abandoned places? well, the exhibition is an experiential thing, really. it's not something you visit, its something you explore and discover. we are opening up the behind—the—scenes of the underground, the places that are secret, hidden behind those doors you walk past every time you commute. and in some of the areas we've recreated things like this, so you can see how people lived and worked underground, took shelter from bombs in time of war and in certain places we have really secret places where churchill, for example, took shelter in the railway executive committee's conversion of down street disused station. an abandoned underground station? that's right. during the height of the blitz the prime minister taking refuge, sleeping, dining, working in this disused underground station on the piccadilly line. fascinating people's stories are brought to life in this. as i say, they allow people to hear, feel and see these kind of places and also be able to come