On 18 May 1980 a young geologist radioed a warning. Moments later he was killed by an explosion more terrible than any seen in north west America. The volcanic blast of Mount St
Helens, that took his and 62 other lives, was 500 times the power of the Hiroshima bomb.
Throughout the summer Horizon followed the geologists as they landed their helicopters in the mouth of the crater, measuring scalding pumice and toxic gas. St Helens had caught them by surprise, but now they are collecting new evidence from a mountain that could go on erupting for 20 years. Narrator Ray Moore Spectacular footage
(THE DAILY TELEGRAPH)
Constantly fascinating
(THEGUARDIAN)
Editor SIMON CAMPBELL-JONES Written and produced by STUART HARRIS
A Horizon production