For more of this incredible footage please watch 'The Polar Bear Family & Me' - Mon 7 Jan 2013 21:30 BBC Two.
This is the terrifying moment a wildlife cameraman comes face-to-face with a fierce 1,000kg polar bear looking for its next meal. The eight-foot predator repeatedly attacks the perspex cage housing Gordon Buchanan as he films a new series. For almost 45-minutes the Scottish filmmaker endures the polar bear's sustained assault as it desperately looks for a weak spot in his pod. The bear, with its powerful paws and giant teeth, was trying to get hold of the 40-year-old so she could feed herself and her two young cubs.