The Curse of Vesuvius

Horizon tells how geologists have reassessed the gruesome evidence from the last moments of Pompeii and have learnt from other recent volcanic disasters, how much more violent the volcano had really been. They can now describe in awesome detail the sequence of events that swamped the city, and are using the evidence preserved in the ash-coated ruins to predict the consequences for today's population when the mountain next explodes – as it one day must.