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Martin and Liz explore a massive asteroid impact 65 million years ago that wiped out the dinosaurs. Later, Martin experiences the power of a NASA supergun.
Krakatoa, a deadly volcano in the heart of Asia, has the possibility of erupting and the power to plunge the world into a cruel dark age.
Martin and Liz survey volcanoes in Iceland to see if they could spread global chaos; Martin tries out an insane motorsport on ashy slopes.