SAN LUIS, Ariz. - A 22-foot deep, 590-foot wide drug-smuggling tunnel with one exit underneath the bed of a Mexican home and the other underneath a defunct Arizona KFC restaurant was discovered last week following the execution of a search warrant, according to a report by KTVK-TV, a Phoenix TV station.

Investigators say the drug tunnel was discovered following a traffic stop on Aug. 13, that resulted in wide range of drugs being found in the trailer of a truck driven by Ivan Lopez, who owned the former KFC restaurant that housed one entrance to the drug tunnel.

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Police say Lopez had over 118 kilograms of meth, over 6 kilograms of fentanyl, over 13 kilograms of white heroin and over 6 kilograms of brown heroin. The 3 kilograms of fentanyl alone translates to over 3 million dosage units, according to police.

Scott Brown, a Homeland Security Investigations special agent, said Lopez had been seen removing tool boxes from the former KFC restaurant earlier in the day. That tip lead police to conduct a search warrant at the location, which revealed a tunnel entrance approximately 8 inches in diameter.

Police say the tunnel was used to smuggle illegal drugs across the border and that the drugs were being pulled from Mexico into the U.S. with a rope.

The tunnel is still under investigation.