Authorities in Mexico and the United States report that they have discovered an underground tunnel running beneath the US–Mexico border, connecting the Tijuana and San Diego areas. Multiple outlets describe the tunnel as a conduit that allegedly supported cross-border illicit activity, including the smuggling of drugs and weapons. Mexican authorities say the structure functioned beyond a simple passageway and was used as a site for storage and logistics, as well as for trafficking weapons, explosives, and illegal drugs. The discovery highlights the use of covert infrastructure to move contraband between the two countries, with officials investigating the tunnel’s intended use and the networks behind it. The reports indicate the tunnel is located underneath the border, raising concerns about how such routes evade detection and strengthen organized smuggling operations. Officials have not publicly resolved all details in the summaries provided, including the extent of any seizures tied to the find or whether specific suspects have been identified, but they continue to examine the circumstances surrounding the tunnel and its operational role.