Watch Nat Geo's Blood the Wall trailer on the migrant crisis at the U.S.-Mexico border

Sebastian Junger and Nick Quested’s documentary, premiering Sept. 30, "is a deep dive into the migrant crisis in Mexico, looking at the caravans coming through the country to the U.S. border, and how it has been exacerbated by drug trafficking and political corruption," per Deadline. “The issues Mexico faces right now are layered and complex and ultimately intertwined with how the U.S. has approached foreign policy and immigration since the Reagan era,” Junger said in a statement.