Story highlights Six people have been charged with drug trafficking

The tunnel features ventilation systems, lights and even a large elevator

It leads to a closet in a Tijuana home

(CNN) A drug-trafficking tunnel nearly half a mile long underneath the California-Mexico border was discovered by federal agents, the U.S. Attorney's Office said Wednesday.

Two tons of cocaine and seven tons of marijuana, worth nearly $22 million, were seized by federal agents who believe this to be the "longest cross-border tunnel ever discovered."

Federal officials say the tunnel stretches from Tijuana, Baja California, Mexico to Otay Mesa, about 500 yards north of the U.S.-Mexico border.

The 800-yard tunnel route begins at a house in Tijuana, Mexico, and ends in the Otay Mesa neighborhood of San Diego.

Agents were hot on the tail of the alleged drug traffickers after they noticed a commercial truck deliver an industrial dumpster filled with wood scraps to an outdoor industrial lot; days later, agents discovered this to be an entryway into the tunnel.

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