39min - In the Caribbean, the team reveals great secrets in the lives of the humpback whale, witnessing a mother defend her calf in the ultimate ocean battle.
37min - The team dives into the depths of the mid-Atlantic to reveal the secret life of sperm whales and discover its hidden prey.
35min - The team is in the Azores to tag a deep-sea giant — the sixgill shark — and learn more about its nightly patterns on the hunt for food in the abyss.
34min - The team is in the Caribbean to find out how great hammerhead sharks navigate their migrations and how adapted they are to life in the shallows.
38min - In the high Arctic, the team takes on the challenge of the polar bear to figure out what the changing habitat could mean for its future.
39min - In the high Arctic, the team meets the bowhead whale, the longest-living mammal, and the Greenland shark, the longest-living vertebrate.
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