Customer Rating One human footstep can start it. Millions of tons of snow and ice, crushing everything in its path.
Avalanches are unpredictable, unstoppable killers.
And they're not made of just snow. Volcanoes like Japan's Mt. Fugen produce deadly pyroclastic flows of ash, rock and poison gas. Watch a powder avalanche hurtle down a mountain at 200 mph, smashing trees like matchsticks. Hang on as skiers race for their lives before rivers of snow. Meet avalanche controllers in Canada's Bear Pass, who use a 105mm canon to safely trigger slides.