The Great Bear Forest, home to the spirit bear, is a vast temperate rainforest 74,000 square kilometres in size and located adjacent to the Pacific Ocean. For the first time, Jeff Turner and his team take a look at the world beneath its surface.
The underwater kelp forests are teeming with tens of thousands of creatures including seals, sea otters and pacific white-sided dolphins.
The island itself is made out of karst bedrock, soluble rocks that lead to a vast underground drainage system of sinkholes and caves. Watch as a team of underwater videographers explores the caves underneath the island, crucial to the salmon's survival and key to the entire ecosystem.
Watch the full doc, Spirit Bear Family on The Nature of Things.