Discovering Hidden Smuggler Tunnels Inside Buildings - Border Security | USBP | CBP

U.S Border Patrol Agents from the San Diego Sector Tunnel Interdiction Group describe the three phases used to stop illicit drug and human trafficking - discovery, interdiction, and remediation.
Cross-border tunnels are dug by transnational criminal organizations to smuggle contraband into the U.S.
Tunnels have been found both on the northern and southern borders through diligent law enforcement work, human intelligence, and even by accident when roads have caved in due to vehicle weight. Since the first tunnel was discovered, cross-border tunnels have become more and more advanced.
When a tunnel is discovered, the passage must be thoroughly blocked to prevent trafficking. Remediation is the process of rendering a tunnel unusable following interdiction. The type of remediation used depends on the tunnel type. For example, a hand-dug tunnel may be filled with concrete, while a corrugated cut-out (in a storm drain, for instance) must be repaired with a contractor-fabricated, CBP-approved patch or liner.
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