text:  I feel I'm alive. I really don't believe that I'm alive. I'm here and I made it. I reached South Sudan with all my data and all my laptop, my externals. Really... Unbelievable. Yeah, unbelievable, yeah. The story of Sudanese cameraman Mohamed Zakaria, as told to our correspondent Barbara Plett-Usher. You're listening to the BBC World Service, and this is NewsHour.