ELPASO, TX () – A man-made cross-border tunnel coming from Mexico was discovered on Thursday, according to the U.S. Customs and Border Protection.

The discovery was made after U.S. Border Patrol Agents conducted an inspection on the storm drain of a tunnel crossing from Ciudad Juarez to the El Paso storm drain system.

At approximately 1:15 a.m., agents discovered the completed man-made tunnel coming from Mexico that breaches into the public storm drain after removing a metal plate covering a 36-by-36-in. entry hole. The tunnel is about 6 ft. tall and 4 ft. wide and is equipped with lighting, a ventilation system, and is braced with wood beams throughout.

“We are proud of the Agents who discovered this smuggling infrastructure used by transnational criminal organizations,” said El Paso Sector Chief Patrol Agent Anthony Scott Good. “Our Agents are relentless in searching and surveying every square mile of the El Paso Sector. With our partners, we are committed to investigating these illicit activities and bringing all perpetrators to justice —those who endanger lives in these hazardous environments and circumvent the legal pathways to entering the United States.”

El Paso Sector will be working closely other officials, including the Mexican government, and the U.S. Consulate General Ciudad Juarez for the remediation of the tunnel.

“The FBI remains steadfast in its commitment to working with our partners along the border to combat illegal criminal activity and address national security threats and will continue to support the ongoing investigation into this tunnel.” said FBI Special Agent in Charge John Morales.