Clive Oppenheimer, geologist and passionate volcano enthusiast, makes his own filmmaking debut with an unconventional take on volcanic activity that reaches far beyond the boundaries of classical geology. With endearing curiosity, wit and ingenuity, he brings together researchers from diverse disciplines, artists and stunning imagery into a cohesive portrait of how volcanoes have shaped — and continue to shape — our planet and civilisation. The film traces the mark of volcanoes across scientific, social and archaeological contexts, asking what the fiery depths of the Earth still have left to tell us.