Volcano: In the Shadow of the Dragon

Vulcanologist Mark Davies watches Soufriere volcano daily. By monitoring 'the dragon's pulse' he makes predictions that could save lives. Volcanic lava can flow faster than you can drive a car. This dense mass of burning ash and explosive gas from a so-called "lahar" flow has the potential to destroy everything in its path. For the residents of Monserrat, this nightmare is a daily reality.