us mexico drug tunnel cocaine pkg_00000318.jpg
KSWB
us mexico drug tunnel cocaine pkg_00000318.jpg
Now playing
01:51
U.S.-Mexico drug tunnel held 2 tons of cocaine
Now playing
03:03
Border patrol detains citizen for not answering question
ana suda interview don lemon on border patrol agent
CNN
ana suda interview don lemon on border patrol agent
Now playing
02:27
US citizen asked for ID after speaking in Spanish
CNN
Now playing
02:09
Panel erupts over Border Patrol agent protocol
immigrant families separated border fact check tapper orig_00014318.jpg
immigrant families separated border fact check tapper orig_00014318.jpg
Now playing
02:21
Border officials change account of shooting
CNN
Now playing
01:09
Trump orders National Guard troops to border
Texas FBI Press Conference
CNN
Texas FBI Press Conference
Now playing
02:04
FBI details Border Patrol agents' injuries
Border patrol agent funeral Rogelio Martinez
US Customs and Border Patrol
Border patrol agent funeral Rogelio Martinez
Now playing
03:41
Questions remain after border agent death
Border Patrol agents patrol the US-Mexico border prior to an Easter mass at the fence separating the two countries at Friendship Park in San Ysidro, California on Sunday, April 16, 2017.    / AFP PHOTO / Sandy Huffaker        (Photo credit should read SANDY HUFFAKER/AFP/Getty Images)
SANDY HUFFAKER/AFP/Getty Images
Border Patrol agents patrol the US-Mexico border prior to an Easter mass at the fence separating the two countries at Friendship Park in San Ysidro, California on Sunday, April 16, 2017. / AFP PHOTO / Sandy Huffaker (Photo credit should read SANDY HUFFAKER/AFP/Getty Images)
Now playing
02:13
Few details released in border agent's death
tx border patrol agent killed dnt_00001313.jpg
tx border patrol agent killed dnt_00001313.jpg
Now playing
01:33
Border Patrol agent killed in southwest Texas
Speaker Ryan
Now playing
01:40
Paul Ryan releases border wall video
State The Green San Diego
State The Green San Diego
Now playing
04:46
Why Border Patrol agents have the highest suicide rate
exp weed hidden in limes CNNTV _00002001.jpg
exp weed hidden in limes CNNTV _00002001.jpg
Now playing
00:48
Border patrol finds weed camouflaged as limes
new us border patrol agents dnt_00001808.jpg
KGBT
new us border patrol agents dnt_00001808.jpg
Now playing
01:52
150 agents deployed to Texas border
national border patrol muesum origwx GR_00000612.jpg
national border patrol muesum origwx GR_00000612.jpg
Now playing
02:16
A tour of the National Border Patrol Museum
ac dnt griffin high cost of border drones_00004819.jpg
ac dnt griffin high cost of border drones_00004819.jpg
Now playing
05:18
Border patrol drones 'invaluable' or 'wasted money'?

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.”

A border first: Smugglers buy U.S. land, build house to hide tunnel, feds say

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

The tunnel was furnished with ventilation systems, lights and even a large elevator that led into a closet inside the Tijuana residence, officials said.

Feds raid drug ‘super tunnel’ with railway on U.S.-Mexico border

The tunnel exit on the U.S. side is a 3-foot-diameter hole that was covered by an industrial dumpster.
Department of Justice
The tunnel exit on the U.S. side is a 3-foot-diameter hole that was covered by an industrial dumpster.

“On the surface, few would ever suspect that traffickers were moving multiton quantities of cocaine and marijuana worth tens of millions of dollars in such an unassuming way, through this rabbit hole in the ground, in full view of the world around it,” said U.S. Attorney Laura Duffy in the release.

The six people were arrested in San Diego and charged with various drug trafficking charges, police said.

“This case is a strong reminder of the vulnerabilities that exist along the Southwest border,” said Hunter Davis, director of air operations for Customs and Border Protection, Air and Marine Operations.

Since 2006, 13th large-scale operational drug smuggling tunnels have been discovered along the California border, federal agents said.

CNN’s Sheena Jones contributed to this article.