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Inside Mexico's Drug Tunnels

Mexico's drug cartels employ increasingly sophisticated technology to burrow under the border. Since 2001, US law enforcement has discovered more than 100 tunnels along the border with Mexico. With deep pockets and extensive networks, the drug cartels hire (or force) engineers with extensive tunnel-construction experience to work for them. While border security agents can rely on sensor-equipped towers above ground, tunnels are uncovered through human intelligence. So far, there is no way to detect these tunnels below ground. More from TIME magazine here: