An inconspicuous hill on the Spanish Island of La Palma bursts open, releasing an avalanche of lava. In its path are the homes of seven thousand residents and the emergency services rush to evacuate.

Mount Nyiragongo in the Democratic Republic of Congo erupts. It engulfs the nearby city of Goma with lava, taking thirty-three lives and destroying almost four-thousand homes.

Chris Horsley heads to Mount Etna, Europe's largest and most active volcano, as it experiences a period of heightened activity and examines the events that led up to the eruptions.

After the Icelandic fishing village of Grindavik is rocked by earthquakes, the volcano of Fagradasfjall is born. Chris Horsley's mission is to help predict the path it may take in the future.

Volcano expert Chris Horsley is called back to the Congo to investigate a potentially lethal threat to over two million people. After a recent eruption, a huge 10-mile-long fracture has appeared in the ground.

Volcano expert Chris Horsley is in Iceland to inspect Katla, one of Europe's largest and most dangerous volcanoes. His task is to install an early warning system on this glacier-covered monster.