"The Fence"

"The Fence"

Ken Regan/HBO via Bloomberg

Part of the 700-mile fence constructed along the 2,000-mile U.S./Mexico border in the new HBO documentary "The Fence" ("La Barda"). The documentary, which airs Sept. 16 at 8:00 p.m. New York time, features interviews with undocumented workers, border patrol agents and human smugglers.