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The explorer sets out to become the first person to reach the summit of a mountain in Greenland's Arctic wilderness, an expedition threatened by the impact of climate change.
This time Steve and his team is kayaking in the Arctic - they face perilous sea ice and have a terrifying encounter with a polar bear.
Steve leads a team of experts including underwater cave explorer Robbie Schmittner, ex-Royal Marine Aldo Kane and diving camera operator Katy Fraser into Mexico's Yucatan Peninsula.