CALEXICO, Calif. (AP) — A man accused of operating a drug-smuggling tunnel in California has pleaded guilty after being arrested in May.

The 35-year-old spent nearly six years in a Mexico prison for gun trafficking before being arrested in the U.S.

The San Diego Union-Tribune reported (http://bit.ly/2wPrvFl ) Monday that Habib Mujica pleaded guilty to conspiring to finance, construct and use the drug-smuggling tunnel discovered in Calexico six years ago.

Homeland Security Investigations agents discovered the tunnel at a warehouse in 2011.

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Mujica says in his plea agreement that he intended to run a business called Baja Bikes as a front to conceal illegal activities.

He faces up to 40 years in prison and up to $750,000 in fines.

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Information from: The San Diego Union-Tribune, http://www.utsandiego.com