Description:15 08 08 00 Canada. View on snowy mountains. A skier crosses the landscape. Safety measures to warn and fight against avalanches on the highway which lines mountains. Patrols on skis cross the landscapes to watch the risks of avalanches. Man looks in sort of case to verify the statements, the data. He calls the army which arrives and prepares a cannon, soldier fires grenade to bring down avalanches, falls. Immediately after the shot, avalanche starts.