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The "survival billboard" stunt is designed to promote the latest game in the Lara Croft franchise, "Rise of the Tomb Raider," which is set in Siberia.
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The eight contestants will have their plight live-streamed on a dedicated website and Twitch from 1pm GMT/8am EST on Thursday. Sadist viewers can vote for the harsh weather conditions inflicted on the competition entrants.
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The last person standing on the ledge, which is situated on a real billboard in London, will win "a trip inspired by Tomb Raider."
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The campaign was created by agency m:united \ McCann London.