Border Wars - Season 2 - Eps 4: Lost in the River
A group of suspected drug smugglers is tracked by the all-terrain vehicle (ATV) night unit at Rio Grande City Station. No sooner are they apprehended than the agents must call in reinforcements from the CBP's air unit, Omaha, to track down a group of illegal immigrants hiding in the brush. Another team of agents searches for nine people missing in the Rio Grande, initially finding only one body. The search becomes more urgent when they find two more bodies the next day.
About Border Wars

Title: Border Wars
First Air Date: 2010-01-10
Last Air Date: 2015-04-15
Status: Canceled
Rating: 7.5/10 (from 2 votes)
Language: EN
Seasons: 6
Total Episodes: 61
Network: National Geographic
Genres: Documentary, Crime, Reality
Production Companies: Unknown
Synopsis
Border Wars is an American documentary television series on the National Geographic Channel. The program follows agents of the U.S. Border Patrol, U.S. Customs and Border Protection, Immigration and Customs Enforcement, and other divisions of the Department of Homeland Security as they investigate and apprehend illegal aliens, drug smugglers, and other criminals violating immigration to the United States and customs laws. The series also follows Air Interdiction Agents, and Marine Interdiction Agents who patrol along the U.S.-Mexico border, as well as southern Florida and Puerto Rico.