The Longest Tunnel Ever Built
b'On June the 1st, Switzerland announced the opening of the world\'s longest tunnel. Called the Gotthard tunnel, it runs under the Alps to link Northern and Southern Europe; and at 57.5 km, it\'s fair to say, you certainly wouldn\'t be able to see the light at the end of it! Our resident technology expert Peter Cowley talked Connie Orbach through the project. Like this podcast? Please help us by supporting the Naked Scientists'