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As marine life around the world is poised to embark on epic journeys across the planet鈥檚 vast oceans, the Blue Planet Live team discover how ocean traffic, over-fishing and noise pollution could impact these sea faring commuters. Steve Backshall, Chris Packham and Liz Bonnin will be rolling up their sleeves with scientists to further understand the importance of migrations, long and short, and understand how human demands on the oceans have made an impact on these wild journeys.

Liz joins scientists on the Great Barrier Reef to witness baby turtles taking their first steps and carries out a live weigh in on young shearwater chicks. Steve finds himself surrounded by stingrays as a team attempt to ultrasound some pregnant females, and over in Mexico鈥檚 Seat of Cortez, Chris hooks up with whale experts in search for the return of a long lost visitor to these waters, the sperm whale.

Live cameras will be standing by on research vessel Atlantis in the Pacific, as deep-sub Alvin resurfaces with some vital signs from the abyss.