Document shows senior Swiss police allowed Nazis to flee to Argentina without correct paperwork [audio 29min]

It is well known that many senior Nazis escaped to Argentina after World War II. The mystery has been how they managed to get there given that no German was allowed to leave the country without an Allied approved pass. Now a document from the time reveals that, in 1948, a representative of the Dutch airline KLM asked Swiss police to ease travel restrictions for Germans travelling to Argentina without the proper paperwork. In the years that followed, many wealthy Germans each spent the equivalent of an average man's wages on luxury KLM flights to the Argentine capital Buenos Aires. It's suggested that this was all part of an elaborate covert plan to help former Nazis flee from justice. Sixty years on, Dutch MPs are calling on KLM to open its books and allow an independent enquiry. BBC journalist Mike Thomson travels to the Netherlands to investigate. Follow a link on the "Document" webpage to view a gallery of images related to this programme.