London has an underground farm in a WWII shelter
An underground World War II bomb shelter in London, which was built 33 metres below the surface and can accommodate up to 8,000 people, has been transformed into a farm that produces herbs and vegetables. The "micro greens" in the 'Growing Underground' farm are grown on recycled carpet beds using hydroponics (soil-free cultivation techniques), its Co-founder Richard Ballard has said.