Photographer Ben Herndon told National Geographic, "For this shot the real challenge was the constant dripping water from the icicles on the cave ceiling above. And there was the small possibility of Craig skewering me with his crampons. I decided to move directly underneath Craig. The trick was to time the shot when he was looking down to find feet placement, so you end up with this sprawling profile on top of the intense eyes."
Soource:benherndon.com and mymodernmet.com