U.S. Border Patrol agents recently discovered and disabled a nearly 3,000-foot-long narcotics smuggling tunnel sitting beneath the US-Mexico border.Agents found the tunnel which linked Tijuana and San Diego in early April while it was actively under construction.The underground passageway ran under part of the Otay Mesa Port of Entry and had a projected exit point near or inside a commercial warehouse space in San Diego, according to an announcement from U.S. Customs and Border Protection.Upon entering the "highly sophisticated" tunnel, authorities were met with barricades seemingly placed to prevent law enforcement from finding its entrance, the announcement noted.SAN DIEGO AUTHORITIES ARREST 3 NONCITIZENS ALLEGEDLY INVOLVED IN TRANSPORTING MORE THAN $5M WORTH OF METHThe tunnel which reached depths of around 50 feet underground at its deepest point measured 2,918 feet long, 42 inches tall and 28 inches wide. It was equipped with lighting, electrical wiring, ventilation systems and a track system for transporting large amounts of contraband.DOT SEC SEAN DUFFY FINALIZES $150M GRANT TO BUILD NEW PORT OF ENTRY ON SOUTHERN BORDERBorder Patrol agents working alongside Homeland Security Investigations and Government of Mexico authorities found the entrance point to the tunnel on Monday inside a house in the Nueva Tijuana neighborhood in Tijuana. The entrance had recently been covered up with freshly laid tile, according to the announcement.TRUMP ADMIN'S DOT ANNOUNCES DEAL FOR HIGH-TECH BORDER CHECKPOINT IN CRUCIAL CALIFORNIA SECTORThousands of gallons of concrete will soon be poured into the tunnel to prevent it from being used by Foreign Terrorist Organizations, U.S. Customs and Border Protection noted."As we continue to strengthen the nations air and maritime border security, its not surprising that foreign terrorist organizations would resort to underground routes," Jeffrey D. Stalnaker, acting chief patrol agent of the San Diego Sector, said in a statement. "Disruption of narcotics smuggling tunnels is critical to protecting American lives."More than 95 tunnels have been decommissioned in the San Diego area since 1993.U.S. Customs and Border Protection did not immediately respond to Fox News Digital's request for comment.