“Dual Survivor” on Discovery Channel is about two people with drastically different backgrounds and survival strategies take on some of the planet’s most unforgiving terrain, from Chile to Zambia, to demonstrate how the right skills and some creative thinking can keep you alive even in the most dangerous situations. This time the challenges are bigger, the environments are more extreme and the differences between the two men couldn’t be greater. Watch it on Thursdays on Discovery Channel, at 9 p.m.

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