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Oskar Gr枚ning was known as the 'book keeper of Auschwitz.'

He was once allegedly responsible for counting the banknotes taken from prisoners being sent to their deaths.

More than 70 years on, Gr枚ning entered a courtroom, leaning on a walking frame.

He is now 93. This morning he asked for "forgiveness."

"I share morally in the guilt," he said.

But he wasn't alone in court. We heard from other survivors who were there, too.

Laurence Rees wrote and produced that series, and wrote the bestseller: "The Nazis: A Warning from History". He said Gr枚ning might have just seen himself as a 'cog in the wheel'.