With a GoPro camera strapped to his helmet, a U.S. Border Patrol agent dropped down into a newly discovered drug tunnel under the U.S.-Mexico border, where he uncovered lights, a series of stairwells and a sophisticated rail system.

The discovery of the once-secret 800-yard tunnel — believed to be the longest ever found in California — led investigators to more than a ton of cocaine and seven tons of marijuana, officials said Wednesday.

The tunnel extends 300 yards from a house in Tijuana, Mexico, to the border and then 500 yards on the U.S. side to a fenced lot in the San Diego industrial area of Otay Mesa. The lot was advertised as a wooden pallet business, with one sign reading, “Otay Pallets — We Buy Pallets.”

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http://www.foxnews.com/us/2016/04/21/800-yard-long-drug-tunnel-found-between-mexico-and-san-diego.html?intcmp=hplnws