Sub-Zero explores the souls of four top Canadian ice climbers. In the series finale we sit down with Will Gadd, a man widely thought of as being among the most versatile outdoor athletes in the world. A veteran of the sport, Will's boundless energy has him constantly seeking new adventures. Not bad for a man in his mid-forties. All-round action hero Will Gadd is a living legend in the truest sense. Will Gadd Is One of the World's Best Ice Climbers...Guess How Old He Is | Sub-Zero, Ep. 4