Ten years ago in Antarctica shooting "Encounters at the End of the World," I met a very fine volcanologist from Cambridge University [Clive Oppenheimer] and we kept talking about doing a film and all of a sudden it became serious when he hinted at the possibility to film in North Korea.

Never wallow in your troubles; despair must be kept private and brief.

I don't want to travel.

I had complete freedom. They [Netflix] knew roughly what I was doing.

You have to be very prudent with what you are doing and what sort of tools you are utilizing. Drones have become a wonderful new tool in filmmaking.

For me, the distinction between documentaries and feature films is not so clear - my "documentaries" were largely scripted, rehearsed, and repeated, and have a lot of fantasy and concoction in them.

If an actor knows how to milk a cow, I always know it will not be difficult to be in business with him.