Stage one is to make their way to the Chinese border in a closed police state. If they make it to the border, they likely did so with bribes, and yet more bribes are necessary with the border guards. Currency, and items of value to trade, are nearly absent from the North Korean environment. It is the most desperate of efforts by any human to succeed at this first stage.
The documentary does a great job of identifying the human rights abuses of China, and the impotent and incompetent UN Refugee Agency (UNHRC) which is charged with helping North Koreans. The documentary also shows hidden camera footage from inside North Korea.
The Seoul Train DVD is over $200, but free on Netflix.
Map from LiNk.