Authorities seized 4,869 pounds of marijuana from an underground bunker in La Feria on Friday.
Texas Department of Public Safety (DPS) said that the drugs, worth $1.6 million, were found at a property on Joed Road.
Investigators obtained a warrant to search the property after a traffic stop with a Ford F-350.
When DPS pulled over the truck, two people fled on foot and escaped into a brushy area.
Packing material left behind in the truck, led authorities to the property on Joed Road.
Inside the bunkers, DPS Criminal Investigation and Border Patrol agents confiscated the drugs and a firearm.
The case is still under investigation.