British photographer Charles Ommanney spent three weeks traveling the length of the U.S.-Mexico border for an upcoming mini-documentary about immigration. The images he collected along the way illustrate the frustration of those living along the border and tell a harrowing story of exclusion and disillusionment for those trying to make their way into the U.S. illegally in large part from Mexico and Central America. The first part of the mini-documentary aired Monday on MSNBC. These are some of the things he saw.