Bear Grylls looks back at this reality series which saw two groups of men and women challenged to survive on a pair of remote, uninhabited Pacific islands for a period of six weeks, armed with only a handful of basic tools. It honestly made for tough viewing at times, and there wasn't even a prize to be won for surviving...just respect. Grylls reunites with the people who took part, hearing their reflections on the experience and discussing how they coped with hunger, thirst, and their fellow adventurers.