Task: Question Answering
Input (English): In 1976, in South Africa during apartheid, Ben Du Toit (Donald Sutherland) is a South African school teacher at a school for whites only. One day the son of his gardener, Gordon Ngubene (Winston Ntshona), gets beaten by the white police and gets caught by the police during a peacefully demonstration for a better education policy for blacks in South Africa. Gordon asks Ben for help. After Ben refuses to help because of his trust in the police, Gordon gets caught by the police as well and is tortured. Against the will of his family, Ben tries to find out more about the disappearance of his gardener by himself. Seeing the weakness and helplessness of the blacks, he decides to bring this incident up before a court with Ian McKenzie (Marlon Brando) as lawyer but loses. Afterwards, he continues to act by himself and supports a small group of blacks to interview others to find out what happened to Gordon. The white police notices their intentions and detains some responsible persons. They continue and (to increase their safety) hide the information at Ben's house. Ben lets his son in on his plans. His son and his daughter both get to know the hiding spots, and after the police searched through Ben's house earlier, there is an explosion next to the hiding spot because the daughter betrayed it to the police though the son saved the documents. Gordon's wife, Emily (Thoko Ntshinga) and children are captured as well. Ben's wife and daughter leave. The daughter offers her father to get the documents to a safer place. They meet at a restaurant and Ben gives her the fake documents, which she delivers to the police man. Instead of giving her the documents, Ben gave her a book about art. At the end, Ben is run over by the police man. The policeman is shot by a black assistant of Ben in revenge. 
Question: How were the documents saved?
Output (English): Ben's son saved them