It included an 11,000-mile bicycle ride from New York to the southern tip of South America, sandwiched between a ski-and-dogsled and sea journey in the Arctic and a second sea voyage in the Antarctic.
Gauntlett was nearly killed on that trip when he crashed through Arctic ice in search of a lost glove. Hooper pulled him out of the freezing water, unconscious.
He was medevacked to a hospital in Greenland, where, Hooper recalled for National Geographic, he broached the idea of aborting the trip.
"Rob told me to p*** off, we were definitely carrying on," Hooper told the magazine