Answer:
He was in some sort of prison camp inside German occupied Poland- in the Battle of Krakow ( howitzers played a role, sorry about the two-stage bang)- but as he is not Jewish it is stretching things to call him a Holocaust survivor or refugee. POW, yes,
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According to the Wikipedia article on him, Roman Polanski was half Jewish and was forced into the Krakow Ghetto, but he survived ... I think he counts as a Holocaust survivor.