Episode 4

Kate Humble and Professor Iain Stewart present the final day of their four day journey into our extraordinary and dynamic planet, live from Kilauea on Hawaii, the world's most active volcano. Broadcasting from the summit crater, they look to the future of volcanic forecasting. Ed Byrne uses a bin, plastic balls and some liquid nitrogen to mimic a supervolcanic eruption, while Kate finds an Icelandic volcano which could put the eruption of Eyjafyallajokull in the shade.