This is what the tunnel next to Clapham North tube station used to look like.
And this is what it looks like now.
Steven Dring and Richard Ballard have taken over the space.
And now they're growing herbs in it.
The site, which they've called Zero Carbon Food, requires less energy than a typical greenhouse.
Plus, everything grown there is pesticide free.
It's 2.5 acres in size, which is the same as a medium garden or a very large allotment.
BECAUSE IT'S UNDER THE GROUND.