Note tunnels not checkpoints.

6 Illegal Aliens With Ties to Mexican Cartel Arrested in Drug Trafficking Investigation

"......Moreover, they learned through the trial how El Chapo came to be known as “El Rapido” meaning the speedy one, in the 1980s by building cross-border tunnels that allowed him to move drugs from Mexico into the United States faster than anyone else."

https://www.theepochtimes.com/6-illegal-aliens-with-ties-to-mexican-cartel-arrested-in-drug-trafficking-investigation_2805660.html