Daredevils want to go where no one has gone before. Sometimes that leads to crazy ideas, such as riding a dirtbike down in the crater of an active volcano. Off the coast of Greece, on a small island formed by a still-living volcano, one of Red Bull's professional riders takes his dirtbike down the ridge into the very center of the volcano, where activity is so frenzied that steam vents are popping up in every direction. The resulting video looks like something from another planet.

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