A couple of experienced border-crossers wait for night to fall, as one man climbs a tree to look for landmarks that will guide them to Tucson, Arizona. These two men have traveled this underground railroad several times in the past. This endless cycle continues as both members of the political fence continue to talk about the most cost-effective manner, both politically and economically, to solve this human exodus which claims hundreds of lives each year. .Sonora-Mexico. 01/23/05.