Here's a pic of him after being rescued. An amazing story. I'm sorry to say that I hadn't heard it prior to today.
The same director made a documentary about his escape.
It was called “Little Dieter Needs To Fly”. Werner Herzog confessed to adding some visual devices like Dieter’s “habit” of reflecting when he opens doors (freedom) but the film uses historic footage, narration, and a return to the original route.