The amount of available oxygen at the highest place on Earth is just under 7. Explorers risk their lives and test their lungs traveling to these great heights atop mountains. Who are these adventurers and why do they do it? Turn the pages to find out.
Extreme explorers push the limits of exploration by scaling mountains trekking across polar ice diving into the ocean depths and more. Follow these brave explorers and learn what they uncover about some amazing places around the world.