A look at the moments that nearly stopped the Expedition teams in their tracks, to the points where taking one step further meant no turning back.
A look at close encounters with creatures, including the worlds largest land predator. Plus, close encounters in flooded caves and on sheer cliffs.
We unpack the story of the world class teams behind five expeditions. From the remote Arctic wilderness to flooded caves of Mexico their expertise are key.
A special look behind the scenes at the work of Steve's crew - going back to examine some of their most daring explorations.