Reporter: Charles Wooley
Producer: Danny Keens
We've witnessed plenty of courageous and often crazy feats over the years.
But in all of Charles Wooley's time working on this program, he's never encountered anything quite so jaw-droppingly insane as extreme kayaking.
The guys who love this sport don't so much live on the edge as throw themselves off it.
They paddle their tiny kayaks over massive twenty-storey high waterfalls, reaching speeds of two hundred kilometres an hour as they plummet, nose first into the churning water below.
They've shattered bones and broken backs. But, in their world, coming face to face with death is the only way to really live.
SLIDESHOW: Extreme kayaking