Nat Geo’s new documentary “Blood on the Wall” takes viewers to Central America, as a caravan of migrants seeking a better life heads north to the United States, while narco-traffickers — part of the cause for the caravan — move drugs and money back and forth across the same border. The film, from Academy Award-nominated director Sebastian Junger and Emmy-winning producer Nick Quested, explores the depths of corruption plaguing Mexico and Central America and the policies of the past that have made it impossible for everyday people to find justice. Shot in the same journalistic style as their other films, “Hell on Earth: The Fall of Syria and the Rise of ISIS,” “Korengal,” and the Oscar-nominated “Restrepo,” the documentary highlights the humanity of the migrants and shows how politics, the drug trade, violence, and the desire for safety result in unbelievable anguish happening in plain sight. Producer Nick Quested is available for interviews. Contact Johanna Ramos-Boyer at (703) 991-8328; jboyer@rtirguests.com