Caves, Canyons, and the Deep Blue Sea

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  • Source:
    Extreme Sports and Their Greatest Competitors. 2015, p42-53.
  • Additional Information
    • Abstract:
      Caves, Canyons, and the Deep Blue Sea While some adventurers go for alpine heights, others are drawn to the extreme depths of caves and canyons. Those destinations present rewards—and risks—of [...]