There are 50 active volcanoes in Japan, and this bubbling, sprawling molten place sometimes feels like the 51st.' Twice in 30 years Tokyo has been destroyed. Today it is the world's biggest city - with problems to match. , By day, a planner's nightmare of smog, sewage and student violence. By night, a vast pleasure palace of lurid fantasy. And everywhere a feeling that men and women are no longer being drawn willingly towards the city. They are being sucked in as if the city itself had an appetite, and will gorge itself on people until it finally erupts once more. Narrator Ian Holm Written and directed by CHRISTOPHER RALLING