Thirty-three metres beneath Clapham High Street in south London, rows of green plants once grew inside tunnels that were originally built as a World War II air-raid shelter. The Growing Underground project used hydroponics, artificial lighting and tightly controlled conditions to produce salad leaves and herbs without natural sunlight. The farm was developed in the former shelter by entrepreneurs Richard Ballard and Steven Dring and began operating commercially in the mid-2010s.
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