Live from the town of Kalapana, destroyed 20 years ago by Kilauea's lava flows, the team explores the connections between volcanoes, earthquakes and tsunamis, revealing that they are all linked to the interaction of tectonic plates. Iain travels to the Bay of Naples in Italy where he explains that the world's most devastating eruptions and seismic events take place at specific type of plate boundaries. Plus, Kate descends 150m into the mouth of a dormant volcano in Iceland and, closer to home, (presumably the) Ed Byrne attempts to recreate the conditions of an earthquake measuring 8 on the richter scale from the safety of the lab.