VAN HORN, Texas — In a part of the United States that is so remote it’s where rockets like the one that carried Jeff Bezos to space are launched, men dressed in camouflage sneak across the border with the hope of evading authorities.

While southeast Texas is the epicenter of the southern border’s illegal migration crisis, West Texas faces a growing problem that is unlike those in other parts of the border. In the Border Patrol’s Big Bend region of West Texas, which stretches from Del Rio to El Paso, groups of men cross day and night and then spend up to a week trekking through the mountains and desert to avoid detection and meet up with drivers waiting on the highway.