In 2016 filmmaker/photographer Pete McBride and writer Kevin Fedarko set out on a 750-mile journey on foot through the entire length of the Grand Canyon. From the outset, the challenge was far more than they bargained for. More people have stood on the moon than have completed a continuous through hike of the Canyon. McBride and Fedarko took a sectional approach, achieving a feat that many adventurers have taken decades to complete. Others have lost their lives trying. But their quest was more than just an endurance test – it was also a way to draw attention to the unprecedented threats facing one of our most revered landscapes.