U.S. Customs and Border Protection officers at the Mariposa Port of Entry seized more than $1.6 million worth of marijuana hidden inside wire spools.

The seizure began last Friday when a Mexican man pulled up to the port in a tractor-trailer carrying farm equipment and commercial-sized spools of wire, and was selected for a secondary inspection, CBP said in a news release.

During the inspection, an X-ray revealed irregularities within the spools, and they were offloaded. Officers then drilled into the spools and found each contained metal boxes filled with nearly 3,300 pounds of marijuana.

The drugs, tractor-trailer and equipment were processed for seizure, CBP said. The driver was turned over to federal investigators

“This seizure is the direct result of the meticulous work of our CBP officers,” said Nogales Port Director Guadalupe Ramirez. “The officers' dedication in protecting America’s front line prevented the contraband from ending up in our communities.”