A 60-feet long tunnel allegedly used for drug trafficking has been found in an abandoned property near the US-Mexico border, according to authorities.
The discovery was made after police in Tijuana received an anonymous tip about suspicious activity in the area.
Subsequently, they found the tunnel approximately a mile away from the San Ysidro border post.
The tunnel, believed to have been designed for smuggling drugs across the border between Tijuana and San Diego - in the US State of California - was found by investigators from the Attorney General's Office (FGR) on May 12.
The finding comes as the Biden administration is changing migratory rules discarding the infamous Title 42 ruling.
Title 42, which expired on Thursday last week, allowed authorities to use a public health law to rapidly expel migrants crossing over the border, denying them the right to seek asylum.
US officials turned away migrants more than 2.8 million times under the order.
The tunnel, which is not believed to have been used by migrants authorities believe, extends 100 feet deep and 60 feet long, and the entrance is located in a humble house in the Libertad Part Alta neighbourhood, an area known for being a hideout for people traffickers and drug traffickers.
Although investigators reportedly did not find anyone at the site, they did recover nine plastic bags containing methamphetamine hydrochloride.
Local media has reported that US authorities have yet to find the tunnel's exit point.
The entrance to the home is under construction and there is a sign saying "this property is for sale," local media report.
When they arrived, investigators reportedly did not find anyone there but they did recover nine plastic bags containing methamphetamine hydrochloride.
Neighbours in the vicinity claimed they had not observed any suspicious activity around the house that would suggest human smuggling.
They mentioned that the only sounds heard at night were passing vehicles.
This discovery of the tunnel is not unusual for Tijuana, which has a history of uncovering such underground passageways utilized for drug smuggling or unauthorized migration into the US.
Such practices date back to the 1990s and were pioneered by drug lord Joaquin 'El Chapo' Guzman, one of the founders of the notorious Sinaloa Cartel.
According to Mexican authorities, at least 15 tunnels have been discovered on the California-Mexico border since 2006, with the Otay industrial zone being a popular location due to its terrain making construction easier.
