Christian - The Angolan entry visa is unobtainium, though I know two people headed to Angola in the near future, one of whom is South African (and spent time as a military consultant and mercenary in Angola long ago) and one of whom is an election observer from Geneve. A note to other travelers: I spent time in Haiti and in Tunisia as an election observer. This is an excellent and amazing way to volunteer internationally. My background as an international economist and lawyer let me get a spot more easily than some others might (being affiliated with a university or with the legal profession tends to help), but the reality is that there is a shortage of people willing to be election observers in many of these parts of the world and it is worth looking into this as an "activity" as part of a broader expedition. I'm not saying you should become an Angolan election observer just to get entry papers (this seems a bit overboard), but that it's a great opportunity to understand the local people, culture, and political system that is often overlooked. For those interested, I'm happy to speak with academics, consultants, and UK or US attorneys about the process and whether this is a good activity to include in a future expedition.