Extremely good illustration and explanation of a not easy technique to make fire with nothing but a knife and wood. In German its callede "fire-drilling". The guy speaks little but then a very good and well-pronounced Austrian German and so Google translates this well into English subtitles, if you activate them.
Best video on this matter I have ever seen. The guy runs an outdoor survival school in Austria.
I know from own experience that this technique works, but is not easy to aquire. Better you always have flintstone and a sharp-edged steel with you.
Thats a breeze in comparison.