National Geographic photographers can find themselves in unusual, extreme and potentially dangerous situations, trying to capture the 'never before seen' images the magazine is famous for. However, contributing photographer Paul Nicklen's story of his close encounter with a huge Leopard Seal (one of the top predators in the Antarctic), shows there's still opportunity for surprises in the job.

We heard about this video following Nicklen being given the Veolia Environnement Wildlife Photographer of the year 2012 award.