Via Fox News: Sophisticated tunnels show border security driving criminals underground
"Tunnels are definitely the new paradigm for smuggling organizations who have to adjust to the constriction caused by border security strategies and the residual circumstances of a chaotic border," said Victor Manjarrez, associate director of the National Center for Border Security & Immigration at the University of Texas-El Paso.
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Since 1990, more than 140 tunnels have been discovered mostly on the southwest border of the United States, according to a 2012 Department of Homeland Security Office of the Inspector General report, with an 80 percent increase in tunnel activity occurring since 2008.
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