How the FBI Tunneled Into a Cartel's Underground Empire

Beneath the busiest land border on Earth, a criminal network spent years boring tunnels the size of subway corridors to move contraband past every sensor and camera above ground. Federal agents spent five years mapping the underground empire before making their move — the result was the largest single tunnel seizure in U.S. history. San Diego, Otay Mesa, 2006–2011: Operation Unified Resolve and the engineering feat that rewrote border enforcement forever. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FBI DOSSIER opens the file on the investigations behind modern federal law enforcement — the sting operations, undercover work, manhunts and takedowns that never made the evening news in full. Corruption, cyber, organized crime, espionage, high-stakes fraud: one case, one file, every day. 🔔 Subscribe:    / @fbidossierusa   📁 New case file daily. #FBI #TrueCrime #FBIFiles #Documentary #Crime #Investigation