London’s first underground farm has begun working in a big disused bunker which used to belong to the underground transport system.
The crops produced in the subterranean farm are being used in dishes of London's famous restaurants. The products are all micro herbs which are allowed to grow to first leaf before harvesting, usually when they're about 25 days old.
Experts say the farm is similar to a conventional greenhouse except that it is always using artificial light. Meanwhile, strict hygiene rules aim to restrict any transfer of soil or waste from above ground to the growing areas below are being implemented.