More than 100 countries have backed the vault, which will store seeds, packaged in foil, at sub-zero temperatures.
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The vault’s purpose is to ensure survival of crop diversity in the event of plant epidemics, nuclear war, natural disasters or climate change; and to offer the world a chance to restart growth of food crops that may have been wiped out.

At temperatures of minus 18C (minus 0.4F), the seeds could last hundreds, even thousands, of years. Even if all cooling systems failed, explained Mr Riis-Johansen, the temperature in the frozen mountain would never rise above freezing due to the permafrost on the mountainside.