South-Korea: As temperatures rise, farmers plant crops in tunnel

Behind a blue wall that seals a former highway tunnel stretches a massive indoor farm bathed in rose-tinted light.

Fruits and vegetables grow hydroponically — with no soil — in vertically stacked layers inside, illuminated by neon-pink LEDs instead of sunlight.

Operators of this high-tech facility in South Korea say it is the world's first indoor vertical farm built in a tunnel. It's also the largest such farm in the country and one of the biggest in the world, with a floor area of 2,300 square meters (25,000 square feet), nearly half the size of an American football field.


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