To make up for the lack of natural light, the plants are grown beneath LED lights that bathe the bunker in an eerie pink glow. The lights shine the brightest at night when electricity is the cheapest. The produce is grown with hydroponics, meaning the seeds rely on a cocktail of mineral nutrients and a water solvent rather than soil.

Before Growing Underground moved into this space, the shelter had been abandoned for 70 years. It’s one of eight deep-level bomb shelters built around London during World War II. At one point the large shelter housed 8,000 troops in a labyrinth of stairwells and tunnels that stretched for more than two miles over 100 feet underground.

All eight of the deep-level air-raid shelters feature a pair of parallel tunnels 16 feet and six inches in diameter and 1,200 feet long. Ten tunnels were planned to house a total of 80,000 troops, but only eight were constructed.

The company now offers tours to the public, allowing visitors to tour the eerie pink farm of the future deep below the buzzing city streets and take home micro herb salad harvested straight from the farm.