Orca whales have hunted chinook salmon along the Pacific Coast of the United States for years. For the last 40 years, renowned whale scientist Ken Balcomb has closely observed them. Orcas need roughly a million salmon a year but as salmon numbers plummet so do orcas. This documentary takes an insight into how four dams are causing a scarcity of chinook salmon and pushing the critically endangered southern resident orcas toward extinction.

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