Will Gadd and Tim Emmett discover the holy grail of ice climbing, Helmcken Falls, Canada where a cave features hundreds of feet of overhanging, barely climbable ice.
'Sketchy' Andy Lewis takes the fledgling sport of slack-lining to new heights, performing aerial tricks like back-flips, BASEjumping off the line and even soloing highlines naked.
Speed alpinist Ueli Steck dances up faces in the Himalaya and the Alps, including his record-smashing ascent of The Eiger North Face. Ueli also teams up with fellow soloist Alex Honnold to break records on El Capitan.
Welcome to the wildest competition known to man -- the speed record on the Nose route of El Capitan. Yosemite legends Dean Potter and Hans Florine go head-to-head, racing up 3,000 feet of vertical rock in under three hours, risking life and limb.
