What would happen if all of the world's volcanoes erupted on a single day? Today, some 40 volcanoes are currently erupting, and more than a thousand sleeping giants could awake anytime. We join scientists around the globe as they deploy the latest technology to understand and predict volcanic behavior. Spectacular footage of past and current eruptions, combined with CGI based upon the latest scientific discoveries, puts us right in the heart of volcanoes. Then, by speeding up the action into a single day, we get a breathtaking new perspective on the remarkable forces that have shaped our planet for millions of years.