Just that - if you were a bona fide war criminal, you'd like to disappear yourself from Europe - but you'd need some assistance in doing so. U-530 and U-977 ended up in Argentina after the war, for instance - who came with them is still disputed. (That being said, I don't buy into the 'Hitler escaped to Argentina in a submarine!' idea - but that some of his henchmen might have? Absolutely.)