During a routine crime investigation, Kansas City police discovered a series of underground dirt tunnels being used by the city’s homeless.

Local affiliate KMBC was on hand for the discovery when newscasters accompanied Kansas City Police Officer Jason Cooley, who was leading an investigation of stolen copper wiring from a nearby grain mill.

While checking on the seemingly ordinary homeless campsites, Cooley discovered a series of tunnels that went several feet under the earth and stretched nearly 25 feet.

“It was kind of in a little hill and probably four feet beneath the surface,” Cooley told the Kansas City Star.

Hope Faith Ministries, a local homeless organization, said the group had never seen anything like it. Carla Brewer was on site from the organization, offering the homeless individuals a place to shower and sleep away from the camp.

Police said they were especially concerned about a pile of dirty diapers discovered next to one of the underground tunnels.

"We're working to find out if, in fact, they've got kids down here, because this is not a safe environment for that," Cooley said.

The tunnels appear expertly crafted and obviously required a substantial amount of time and effort to create. In fact, authorities said they aren’t exactly sure how the individuals squatting at the site were able to create them.

After discovering the tunnels, a police robot was used to further investigate the underground dwellings. Once police were able to confirm no one was inside them, they brought in a tractor to fill in the tunnels.