For close to two decades, thousands of Central American migrants have lost their dreams, limbs and even their lives trying to illegally cross Mexico. Crossing Mexico is the insurmountable challenge that faces all those whose only goal is to reach the United States. The nightmare begins the moment they step onto Mexican soil. Here they must jump on to a cargo train known simply as "La Bestia" or "The Beast", an agonizing journey from which there is no way back, a travesty comparable only to hell.