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Bear Grylls takes celebrities on exhilarating adventures well outside their comfort zones.

Bear Grylls takes comedy writer and actress Miranda Hart on a once-in-a-lifetime expedition to the spectacular Swiss Alps.

Bear challenges novice Miranda to go far beyond her comfort zone with a series of exhilarating adventures during an intense two-day expedition.

Miranda traverses a glacier, crosses crevasses roped to Bear, tackles deep snow in snow shoes and completes a huge boulder scramble. She also faces her greatest fears when she flies in a helicopter and abseils down a waterfall.