<https://www.vallartadaily.com/border-tunnel/#primaryimage>
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"A U.S. Homeland Security Investigations (HSI) Special Response Team agent photographs the tunnel exit point during investigation of a cross-border tunnel linking Calexico, U.S. and Mexicali, Mexico in Calexico, California March 23, 2016. REUTERS/U.S. Immigration and Customs Enforcement/Handout via Reuters"
<https://www.vallartadaily.com/border-tunnel/>