Will Self continues his 50 kilometre circumnavigation of the Large Hadron Collider at CERN just outside Geneva - entirely on foot. Following the course of the Collider through the French and Swiss countryside, Will stops at regular intervals to descend to the tunnel below and view the experiments. Invited to 'feel the wonder' of particle physics, Will is so far baffled. Far from wondrous, he very soon finds himself wondering about his own capacity for misunderstanding - expressing concerns that his walking tour may be a complete waste of time. And to make matters worse, just as he emerges from one of the tunnels Will is engulfed by a huge thunderstorm. Producer: Laurence Grissell.