Avalanche – making a deadly snowstorm

Explosives, snow and a car were used to trigger an avalanche in an episode of BBC2's Horizon Programme to reveal more about the mystery behind this natural rollercoaster. The experiment was led by avalanche expert, Professor Jim McElwaine, from Durham University's Earth Sciences department. In the programme, Jim and the team were filmed as they set up the experiment before using explosives to trigger an avalanche in a remote part of the Canadian Rockies. Their aim was to see into the middle of the avalanche in order to explain how it works. Before releasing over 1,000 tonnes of snow from the mountain top, the team dropped a car from a helicopter, leaving it in the path of the avalanche. A thermal camera, previously used by the military to measure nuclear explosions, was attached to the car. Once the camera, and other instruments, were retrieved from the snowy depths, they were taken to Durham University for analysis.