Hiorns doesn't know exactly when it started: "It's got something to do with taking something out of the air and putting it under the skin of the land." For the artist, it was a way to provoke an idea. In the summer of 2016, along with Farmer Tim, he buried a military passenger aircraft in an undisclosed location in the East of England. And now the idea has grown internationally, becoming a "network" of aircraft under our feet.

Tim was intrigued by Roger’s project and had the land and know-how to help him bury another. Ensuring the land was moist enough to cut cleanly, alone on his digger he dug a giant crucifix-shaped hole.