The farm in a tunnel 100ft beneath London

Two entrepreneurs Richard Ballard and Steven Dring have set up a 2.5 acre crop farm below the Northern Line, near Clapham North in London. The first test garden, which has been up and running for a few months as part of a commercial project called Growing Underground, backed by television chef Michel Roux junior. The “farm“ itself consists of table-height beds of hemp in which salads and herbs are being grown hydroponically. That means nutrient-rich water floods the beds once a day before bein