tunnels

MEXICO CITY — When the Trump administration announced this summer that illegal crossings into the U.S. from Mexico had reached historical lows, Homeland Security Secretary Markwayne Mullin declared, “Our border is CLOSED to lawbreakers.”

Even so, the administration continues to pressure both Mexico and U.S. officials serving there — publicly and behind the scenes — to curb illegal immigration further. The crackdown has prompted smugglers to become more creative, turning more often to tunnels once reserved for transporting drugs.

White House Deputy Chief of Staff Stephen Miller, in the White House on Sept. 4, has been the main architect of the Trump administration’s immigration policies.

(Jacquelyn Martin / Associated Press)

Stephen Miller, the main architect of President Trump’s immigration policies, has been in near-daily communication with senior U.S. law enforcement officials, including the U.S. ambassador to Mexico, Ronald Johnson, looking for new ways to stop migrants from entering the United States, according to people familiar with the conversations.

An average of 400 migrants were apprehended while crossing into the U.S. every day in July, according to data by U.S. Customs and Border Patrol. It’s a precipitous drop from the thousands who crossed daily at the peak of a migrant surge in 2022.

Sometimes the number of crossings has dropped to 200 a day. But for Miller, that reduction is still not enough, said sources not authorized to speak publicly about internal matters. Miller’s goal, they said, is to have zero migrants entering the U.S.

Miller has directed officials to increase investigations into migrant smuggling networks, people familiar with his directives said.

Mexican Foreign Minister Roberto Velasco Álvarez, left, and U.S. Secretary of State Marco Rubio in Washington, where they met Aug. 26 to discuss what the minister called “priority issues on the bilateral agenda.”

(Chip Somodevilla / Getty Images)

Since returning to the White House in 2025, Trump has often asked Mexican President Claudia Sheinbaum to crack down on immigration. On Aug. 26, Secretary of State Marco Rubio met with Mexico’s foreign minister, Roberto Velasco Álvarez, and urged him to take “decisive action on illegal immigration,” according to a statement from the State Department.

The Trump administration’s border crackdown has been so effective it’s forced some smugglers literally underground.

Mexican drug cartels are increasingly turning to tunnels built for drug smuggling to ferry migrants into the United States. They are linking into sewer drains, according to people familiar with the trend.

Though the number of migrants apprehended while using tunnels appears to be relatively small — there are no hard statistics — authorities believe it is increasing, given the crackdown on the border and financial incentive for the cartels to smuggle people and not just drugs.

“Enforcement along the border has become more robust and that has increased the demand for alternative methods of passage,” said David Shirk, director of the Justice in Mexico program at the University of San Diego.

The Trump administration has added extra miles of razor wire to border fences, has increased surveillance technology and uses autonomous Predator drones with surveillance and infrared technology to monitor swaths of the border for migrants crossing into the U.S.

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1. A bulldozer sits near Santa Elena Canyon on Aug. 14 in Big Bend National Park, Texas, where contractors have begun construction of a border wall. (Brandon Bell/Getty Images) 2. Protesters gather in San Antonio, Texas, on Aug. 28 to demonstrate against construction of a border wall in Big Bend National Park. (Alma E. Hernandez/San Antonio Express-News via Getty Images)

And, picking up on Trump’s “build the wall” pledge from his initial run for president, more border barriers are being built.

Trafficking through cross-border tunnels is not new. In 2023, Ken Salazar, then the U.S. ambassador to Mexico, said there were at least 200 tunnels that spanned the border. Many of them were found linking Tijuana and San Diego.

But in a twist, some tunnels now connect to drainage and sewer systems. This May, authorities captured 19 migrants, including three unaccompanied minors, in the San Diego storm water drainage system. A remote surveillance camera spotted the migrants emerging from the system.

The smugglers were two brothers who had previously been charged with methamphetamine trafficking in the Northern California town of Yreka in 2017.

Smugglers employ tunneling specialists whose work is getting more sophisticated, outfitting the tunnels with lights, ventilation systems and sometimes mini rail lines. Many tunnels are faster, safer and much more expensive for migrants who would otherwise face increasingly dangerous mountain and desert routes, experts said.

Last year, Customs and Border Protection and Homeland Security Investigations agents also found a tunnel that ran under the Rio Grande from Ciudad Juárez, Mexico into El Paso.

The passage tapped into the El Paso sewer system, where, according to U.S. authorities, migrants surfaced from a manhole. They climbed into a box truck outfitted with a trap door that was parked over the manhole.

Cartels charge migrants from Latin America up to $15,000 dollars each to use tunnels to El Paso, an official familiar with the dynamics said. For people from the Middle East or Southeast Asia, the price can be as high as $25,000.

The tunnel traffic continues to vex U.S. officials.

A Homeland Security Task Force drug investigation of a supposed retail store in Otay Mesa, Calif., resulted in the discovery of a sophisticated cross-border tunnel leading to Tijuana.

(U.S. attorney’s office)

In Tijuana, one tunnel discovered last year stretched from Tijuana to what appeared to be a Buy 4 Less store near the Otay Mesa port of entry. The store never had customer traffic, so U.S. law enforcement suspected it hid a tunnel and began monitoring the business.

Authorities raided the building and found the entrance to a tunnel controlled by the ruthless Jalisco New Generation Cartel. It was 55 feet deep and nearly half a mile long. It featured a hydraulic lift, ventilation and a rail and cart system. Authorities stopped a freezer truck after it left the location and seized more than a ton of cocaine, worth roughly $45 million.

In 2024, U.S. law enforcement found a tunnel in the border town of San Luis, Ariz. Authorities said it was used to smuggle migrants and drugs. Its exit was hidden in an abandoned KFC restaurant.

This article was co-published with Puente News Collaborative. Fisher is a special correspondent.