Inside Cross Border Tunnels: A Global Security Threat

U.S. President Donald Trump based much of his campaign on illegal immigration and border security. The chant ‘build that wall’ was sounded in rallies before and after the elections. But the wall as high as it may be does not address the real border threat — hundreds of tunnels dug from Mexico were exposed in the last few years, many more are believed to be still undetected, and other places in the world face underground activity as a major threat.