Here's a tunnel that's being used. It is an underground farm in an old air raid shelter 100 feet under Clapham High St. They have been running two or three year

Here's a tunnel that's being used. It is an underground farm in an old air raid shelter 100 feet under Clapham High St. They have been running two or three years and are steadily expanding their fresh salad distribution through premium supermarkets and food shops: http://growing-underground.com/world-1st-subterranean-farm/ http://growing-underground.com/world-1st-subterranean-farm/