Volcano expert Chris Horsley is in Iceland to inspect Katla, one of Europe's largest and most dangerous volcanoes. Katla erupts every 40-80 years, and is long overdue; when Katla does blow, the eruption will be catastrophic, releasing a massive ash cloud and freezing tsunamis. To avert utter disaster, Chris has been tasked with installing an early warning system on this glacier-covered monster.

Volcano expert Chris Horsley is in Iceland to inspect Katla, one of Europe's largest and most dangerous volcanoes. Katla erupts every 40-80 years, and is long overdue; when Katla does blow, the eruption will be catastrophic, releasing a massive ash cloud and freezing tsunamis. To avert utter disaster, Chris has been tasked with installing an early warning system on this glacier-covered monster.