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 Mohammed Zakaria and his journey out of Sudan. He was speaking to our correspondent, Barbara Plegrasher. You're listening to NewsHour from the BBC World Service.