When most people dig up their backyards, they’re usually left with two things: dirt and a hole.

But when Reddit user captantarctica excavated a piece of land in Tucson, Ariz., recently, the redditor found a fascinating artifact of the Cold War: an abandoned bomb shelter. The user posted photos of the discovery in the Tucson community.

Captantarctica, a fire department confined space rescue technician, estimates the shelter was built around 1961 and probably was filled in some time between the late 1960s and early 1970s or “right after the Cuban Missile Crisis was over.”

What does the user plan to do with this newly found subterranean dwelling? Captantarctica will renovate the shelter first but isn’t sure how to use it after that.

There is a recent precedent for putting bomb shelters on the open market. A sprawling bunker in Georgia said to be able to withstand a 20-kiloton nuclear explosion went on sale this week for $17.5 million. Another option might be to create a real-life Fallout 4 attraction around the underground shelter, something that might have crossed Captantarctica’s mind already judging from this photo.