By Emma Thomas PUBLISHED: 07:08 EST, 31 October 2013 | UPDATED: 08:29 EST, 31 October 2013 A secret tunnel from Mexico into the U.S. has been found by customs officials. The highly sophisticated tunnel runs underneath the border connecting the Mexican city of Tijuana with San Diego, California. Immigration and Customs Enforcement said the passage had been recently completed. Officials didn't elaborate any further in a brief statement. Smuggling: Immigration and Customs Enforcement said the passage, near Tijuana airport, had been recently completed Mexican news organizations published photos that show a deep, well-built tunnel near Tijuana airport. The airport is four miles away from the American border by road, but only a matter of yards away in a straight line.
@highlight
Tunnel connects Mexican city of Tijuana with San Diego, California
@highlight
Dozens of tunnels used to smuggle marijuana discovered along the border
@highlight
Last year, a 240-yard drug-smuggling tunnel was unearthed in Arizona
Raids last November on two tunnels linking @placeholder and Tijuana netted a combined 52 tons of marijuana on both sides of the border.