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CALEXICO, Calif. – For the first time in a decade, federal agents uncovered a completed drug tunnel in Calexico, a border city about 100 miles east of San Diego.

The opening of a drug tunnel was found in a fairly new home in Calexico, according to federal drug enforcement officials Wednesday.  The home is on land that was purchased for $240,000, had three bedrooms and was constructed last year for the sole purpose to hide the tunnel.

Contractors were instructed to leave room for a “floor safe,” agents said.

The 415-yard tunnel is unique, because on the southern end in Mexicali, the entrance is located in an open restaurant, federal officials said.

Federal agents said they haven’t seen many tunnels in the Calexico area due to the challenging terrain.

Four people were arrested and face charges, including drug trafficking and money laundering.

Agents executed three search warrants each for the Calexico home, another residence where traffickers would stash marijuana, and a warehouse.  In all, agents found 3,000 pounds of marijuana during their searches.