This new special explores British Columbia's ecological jewel, the Great Bear Rainforest.

It is an extraordinary place - one of the largest intact temperate rainforests in North America, a place conservationists call Great Bear. On Canada's Pacific coast north of Vancouver, grizzlies, black bears and wolves roam this ancient forest, and dolphins, seals and killer whales patrol its myriad inlets and bays. Wild salmon runs in the midst of it all - connecting the forest with the sea. Now, with the Great Bear rainforest under threat from logging, scientists are racing to prove that the place is so extraordinary that it must be better protected. National Geographic joins a team of experts on a 250-mile scientific adventure as they sail through the pristine waterways of this amazing place.